210 + Interview Questions in Amines in Chemistry – Class 12 Page 1 InterviewSolution

1.	What is the product of the following reaction?(a) 2-Amino-4-phenylazophenol(b) 6-Amino-2-phenylazophenol(c) 2-Amino-5-phenylazophenol(d) 2-Amino-3-phenylazophenolThe question was asked in an interview for internship.My question is taken from Diazonium Salts Chemical Reactions in division Amines of Chemistry – Class 12
Answer» Correct ANSWER is (c) 2-AMINO-5-phenylazophenol Explanation: The reactant (o-aminophenol) consists of both HYDROXY and amino groups. Since the reaction takes place in an ACIDIC medium, the coupling occurs at para position (first preferred) with respect to the amino group. If the reaction was to take place in a basic medium, the coupling WOULD have occurred at para position with respect to hydroxy group.

Discussion

2.	Benzenediazonium chloride is ______ in water.(a) slightly soluble(b) highly soluble(c) insoluble(d) highly insolubleI got this question by my school teacher while I was bunking the class.Question is taken from Diazonium Salts Physical Properties in section Amines of Chemistry – Class 12
Answer» RIGHT answer is (b) highly soluble Explanation: Benzenediazonium chloride is READILY soluble in POLAR solvents like water. However, it is LESS soluble in solvents like alcohol.

Discussion

3.	Aliphatic diazonium salts are highly unstable.(a) True(b) FalseThe question was asked in unit test.My doubt stems from Preparation Method of Diazonium Salts in section Amines of Chemistry – Class 12
Answer» RIGHT answer is (a) True To explain I would SAY: Alkyldiazonium SALTS are HIGHLY unstable as they readily decompose at low temperatures forming a CARBOCATION and nitrogen gas.

Discussion

4.	Which of the following is associated with decrease in pKb value of amines?(a) Increase in acidic strength(b) Increase in basic strength(c) Better proton donation(d) Better electron acceptorI have been asked this question during an interview.The above asked question is from Amines Chemical Reactions topic in section Amines of Chemistry – Class 12
Answer» CORRECT answer is (b) INCREASE in basic strength Easy explanation: The basic strength of amines is expressed in terms of dissociation constant Kb. GREATER the Kb value, stronger the base. It is more COMMONLY expressed as pKb=-logKb. Hence smaller the value of pKb, more is the basic strength of the AMINE.

Discussion

5.	Aniline is insoluble in which of the following solvents?(a) Ethanol(b) Ethoxyethane(c) Benzene(d) WaterThe question was asked in an interview for job.This interesting question is from Amines Physical Properties topic in chapter Amines of Chemistry – Class 12
Answer» Right option is (d) Water Best explanation: Aromatic amines have a very large hydrocarbon part (benzene ring) which TENDS to RETARD the formation of HYDROGEN bonds with water. However, they are soluble in ORGANIC solvents LIKE ethers, alcohols and benzene.

Discussion

6.	The main product formed when the ammonolysis is carried out using excess of iodoethane is _______(a) 1° amine(b) 2° amine(c) 3° amine(d) quaternary ammonium saltThis question was posed to me at a job interview.Question is from Preparation of Amines topic in division Amines of Chemistry – Class 12
Answer» The correct choice is (d) quaternary AMMONIUM salt The explanation is: When an excess of alkyl HALIDE is USED, the PRESENCE of a base will allow the excess HYDROGEN halide formed to be consumed, resulting in the formation of quaternary ammonium salt as a major product.

Discussion

7.	What compound is formed when hydrogen gas is passed through nitrobenzene in the presence of finely divided nickel?(a) Aniline(b) 2-Nitroaniline(c) 3-Nitroaniline(d) 4-NitroanilineThe question was posed to me during an interview.My question comes from Preparation of Amines topic in section Amines of Chemistry – Class 12
Answer» Correct choice is (a) ANILINE The explanation: The nitro (NO2) group of NITROBENZENE is REDUCED to amino (NH2) group by the replacement of TWO oxygens by two hydrogen to give aniline or BENZENAMINE.

Discussion

8.	What is the correct name of the compound with two amino groups around a benzene ring at opposite (para) positions?(a) Benzenediamine(b) 4-Aminobenzenamine(c) p-Aminoaniline(d) Benzene-1,4-diamineThe question was asked by my college director while I was bunking the class.My doubt is from Amines Nomenclature in section Amines of Chemistry – Class 12
Answer» RIGHT choice is (d) Benzene-1,4-diamine To elaborate: Both the amino groups (at PARA position to each other) are given equal importance and is NAMED by giving the prefix di to the MAIN compound. The prefix is also numbered 1 and 4, representing the positions at which amino groups are present in the benzene RING.

Discussion

9.	What is the correct IUPAC name of the compound which has a benzene ring substituted with amino group at one position and a bromine atom at a position para to it?(a) 4-Aminobromobenzene(b) 4-Bromobenylamine(c) 4-Bromoaniline(d) p-BromoanilineThe question was posed to me at a job interview.Origin of the question is Amines Nomenclature in section Amines of Chemistry – Class 12
Answer» The correct answer is (C) 4-Bromoaniline The explanation is: This compound is an aromatic compound which is a BROMO derivative of aniline and is NAMED such that aniline is PRINCIPLE group. The POSITION of bromine is indicated by number 4 which corresponds to the para position.

Discussion

10.	In the IUPAC system, the prefix N^– is generally used for _______ amines.(a) primary(b) secondary(c) tertiary(d) secondary and tertiaryI had been asked this question in final exam.The question is from Amines Nomenclature topic in portion Amines of Chemistry – Class 12
Answer» Correct choice is (d) secondary and tertiary For explanation I would SAY: For the NAMING of 2° and 3° amines, the locant N is used as a prefix to IDENTIFY the substituent attached to the nitrogen ATOM. In case of tertiary amines with same substituent groups, the prefix used is N, N^–.

Discussion

11.	Which of the following is an arylalkyl amine?(a) C6H5NHC6H5(b) C6H5NH2(c) (C6H5CH2)NH(d) (C6H5)3NI got this question in a job interview.This intriguing question originated from Amines Classification topic in portion Amines of Chemistry – Class 12
Answer» Right answer is (C) (C6H5CH2)NH To explain I would say: Arylalkyl amines are aromatic amines which are side chain substituted, i.e., the nitrogen is not directly attached to the phenyl group but to a side chain of the benzene ring. In (C6H5CH2)NH, there are two same groups attached to the nitrogen where it is attached to a BENZYL carbon, instead of an aryl carbon.

Discussion

12.	A diazonium salt ‘X’ forms sulphuric acid as one the by product when is reacts with phosphinic acid to give benzene. Identify ‘X’.(a) Benzenediazonium chloride(b) Benzenediazonium bromide(c) Benzenediazonium hydrogensulphate(d) Benzenediazonium fluoroborateI have been asked this question in quiz.This is a very interesting question from Diazonium Salts Chemical Reactions in portion Amines of Chemistry – Class 12
Answer» The correct OPTION is (c) BENZENEDIAZONIUM hydrogensulphate Best explanation: The H^+ ions from the aqueous solution of acid COMBINE with the negative HSO4^– ions from the benzenediazonium hydrogensulphate to form H2SO4 (sulphuric acid) as the by product.

Discussion

13.	Which of the following compounds has to be used in Gatterman reaction?(a) Chloroform(b) HCl(c) Copper powder(d) Copper chlorideThe question was posed to me in semester exam.I'd like to ask this question from Diazonium Salts Chemical Reactions in chapter Amines of Chemistry – Class 12
Answer» The correct option is (C) Copper powder For explanation: Gatterman reaction is used for the preparation of either chlorobenzene or BROMOBENZENE by TREATING a diazonium salt SOLUTION with either HCl or HBR respectively, in the presence of copper powder.

Discussion

14.	Identify Y in the following reaction.(a) Cu2Cl2/KCN(b) CuCN/KCN(c) Cu2Cl2/HCN(d) CuCN/HCNThis question was addressed to me during a job interview.Asked question is from Diazonium Salts Chemical Reactions in chapter Amines of Chemistry – Class 12
Answer» RIGHT answer is (b) CuCN/KCN The explanation: When BENZENEDIAZONIUM chloride is treated with COPPER CYANIDE in aqueous potassium cyanide solution, benzonitrile is formed. This is also categorized under SANDMEYER reaction.

Discussion

15.	Which of the following cannot be formed from Sandmeyer reaction on benzenediazonium chloride?(a) Chlorobenzene(b) Bromobenzene(c) Iodobenzene(d) BenzonitrileThe question was posed to me in my homework.My enquiry is from Diazonium Salts Chemical Reactions in section Amines of Chemistry – Class 12
Answer» CORRECT answer is (c) Iodobenzene Easy explanation: Sandmeyer reaction is used for the introduction of chloride, BROMIDE and cyanide ions only in the benzene ring of diazonium salts, by replacing the DIAZO GROUP. Iodobenzene is produced by ANOTHER reaction.

Discussion

16.	The preparation of diazonium salts from primary aromatic amines is known as ______(a) acylation(b) alkylation(c) benzonation(d) diazotisationThis question was posed to me by my college professor while I was bunking the class.Question is taken from Preparation Method of Diazonium Salts topic in division Amines of Chemistry – Class 12
Answer» CORRECT ANSWER is (d) diazotisation To elaborate: This is a METHOD of preparation of diazonium salts. This occurs by the formation of nitrosonium ion followed by diazohydroxide, which on protonation gives diazonium ion. This takes up the acid anion to form diazonium salt.

Discussion

17.	Aniline on carbylamines test gives an unpleasant foul odour.(a) True(b) FalseI had been asked this question in semester exam.Enquiry is from Amines Chemical Reactions in section Amines of Chemistry – Class 12
Answer» CORRECT choice is (a) True The best I can EXPLAIN: Aniline is a PRIMARY aromatic amine and REACTS with chloroform and alc. KOH to give PHENYL isocyanide, which is a foul smelling substance.

Discussion

18.	Which of the following groups when present at para position increases the basic strength of aniline?(a) NO2(b) Br(c) NH2(d) COOHThis question was posed to me in exam.My question is from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12
Answer» The correct answer is (c) NH2 The best explanation: ELECTRON donating groups at para POSITION release electrons towards the nitrogen atom, stabilizes the anilinium cation and hence INCREASE the basic STRENGTH. Since NH2 is an electron donating group, p-phenylenediamine will be more basic than aniline.

Discussion

19.	Which of the following is a 2° amine?(a) CH3CH2NHCH3(b) (CH3)3N(c) (CH3CH2CH2)2NCH3(d) C6H5NH2The question was asked in quiz.Asked question is from Amines Classification topic in section Amines of Chemistry – Class 12
Answer» RIGHT answer is (a) CH3CH2NHCH3 The best I can explain: The three groups attached to CH3CH2NHCH3 are one methyl group, one ETHYL group and one hydrogen atom. This means that two of the hydrogen atoms are REPLACED and hence, it is a 2° or SECONDARY AMINE.

Discussion

20.	Which of the following aromatic amines has lower pKb value than ammonia?(a) Benzylamine(b) Benzenamine(c) N-Methylbenzenamine(d) N,N-DimethylbenzenamineI got this question by my college director while I was bunking the class.Question is from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12
Answer» Correct option is (a) Benzylamine The explanation is: In aryl amines, the N atom is directly attached to the benzene ring. This makes the lone pair of N to be in conjugation with the benzene ring, thus making it less available for protonation. WHEREAS, benzylamine is a PRIMARY ARYLALKYL amine and has higher BASIC STRENGTH than ammonia.

Discussion

21.	Which of the following amines is not a gas?(a) Methylamine(b) Dimethylamine(c) Ethylamine(d) TrimethylamineI got this question in examination.My query is from Amines Physical Properties in section Amines of Chemistry – Class 12
Answer» Correct answer is (d) Trimethylamine Best explanation: Lower members of aliphatic AMINES exist as GASES at ordinary temperature. The HIGHER members with three or more CARBON atoms are liquid and still higher ones are SOLID.

Discussion

22.	What is the C-N-C bond angle in the following compound?(a) 107°(b) 108°(c) 109°(d) 109.5°I have been asked this question by my college professor while I was bunking the class.The question is from Structure of Amines in section Amines of Chemistry – Class 12
Answer» The correct option is (b) 108° For explanation I would say: The shown COMPOUND is an amine with three methyl group. This induces a steric effect between the three alkyl GROUPS, and results in a slight INCREASE in bond ANGLE from 107° (bond angle in ammonia).

Discussion

23.	Which of the following is not an amine?(a) NH3(b) CH3NH2(c) C6H5NH2(d) CH3NHCH3This question was posed to me during an interview.My question comes from Structure of Amines topic in portion Amines of Chemistry – Class 12
Answer» Right option is (a) NH3 The EXPLANATION: Amines are CLEARLY defined as ‘derivatives’ of ammonia OBTAINED by replacement of one or more H atoms by an alkyl/aryl group. Therefore, NH3 itself is not an amine, but the base compound for all amines.

Discussion

24.	What is the order of quantities of all isomers of nitroaniline formed on the reaction of aniline with nitric acid and sulphuric acid at 288K?(a) ortho > meta > para(b) para > ortho > meta(c) para > meta > ortho(d) meta > para > orthoThis question was posed to me by my college director while I was bunking the class.This key question is from Amines Chemical Reactions in portion Amines of Chemistry – Class 12
Answer» The correct option is (c) para > meta > ortho For explanation: Nitration of aniline produces nitro DERIVATIVES. Under controlled conditions, aniline is protonated (by strong acidic MEDIUM) to FORM anilinium ION, which is meta DIRECTING. Therefore, apart from p-nitroaniline (51%) and o-nitroaniline (2%), a significant amount of m-nitroaniline (47%) is also formed.

Discussion

25.	p-Iodonitrobenzene can be synthesized from p-nitroaniline.(a) True(b) FalseThis question was addressed to me in an international level competition.My question is based upon Diazonium Salts in Synthesis of Aromatic Compounds in portion Amines of Chemistry – Class 12
Answer» CORRECT CHOICE is (a) True To explain I WOULD say: p-Nitroaniline on diazotisation GIVES p-nitrobenzenediazonium chloride with on treatment with POTASSIUM iodide replaces the N2^+Cl^– group to give p-iodonitrobenzene.

Discussion

26.	If ‘a’ is the pKb value of aniline and ‘b’, ‘c’ and ‘d’ are the pKb values of o-, m- and p- isomers of methylaniline respectively, what is the correct order of the values a, b, c and d?(a) a > b > c > d(b) d > c > a > b(c) d > c > b > a(d) b > a > c > dThis question was addressed to me in a national level competition.My question comes from Amines Chemical Reactions topic in section Amines of Chemistry – Class 12
Answer» The correct ANSWER is (d) B > a > c > d To explain I would SAY: Every ortho substituted aniline (electron withdrawing or electron releasing group) is less basic than aniline and consequently its meta and para isomers. This is because of the ortho effect, which is due to the combination of stearic and electronic factors.

Discussion

27.	Consider three gaseous alkylamines A, B and C or 1°, 2° and 3° respectively. What will be the correct order of their basicity?(a) A > B > C(b) C > B > A(c) B > A > C(d) B > C > AThis question was addressed to me in unit test.I need to ask this question from Amines Chemical Reactions topic in chapter Amines of Chemistry – Class 12
Answer» Right option is (b) C > B > A The best explanation: In the gaseous state, the solvation effect is missing and hence the expected order of BASICITY will be 3° > 2° > 1°. This is because as the number of alkyl groups increase, the +I effect STRENGTHENS and more negative charge is accumulated on the N atom. This MAKES the unpaired share mire available for sharing with the proton of the acid.

Discussion

28.	Which of the following amines are insoluble in water?(a) Methanamine(b) Ethanamine(c) Propanamine(d) BenzenamineThe question was asked in examination.Origin of the question is Amines Physical Properties topic in section Amines of Chemistry – Class 12
Answer» Right choice is (d) Benzenamine The best explanation: LOWER aliphatic amines are soluble in water as they easily form hydrogen bonds with water molecules. Higher amines CONTAINING six or more carbon ATOMS are INSOLUBLE in water due to a large HYDROPHOBIC alkyl/aryl part. Therefore, aniline is insoluble in water.

Discussion

29.	If the boiling point of diethylamine is 329 K, predict the boiling point of ethyldimethylamine.(a) 310 K(b) 329 K(c) 340 K(d) 351 KThis question was addressed to me in examination.The above asked question is from Amines Physical Properties in section Amines of Chemistry – Class 12
Answer» The correct ANSWER is (a) 310 K Explanation: Diethylamine is a 2° amine whereas, ethyldimethylamine is a 3° amine. In 3° amines, there are no hydrogen ATOMS available for intermolecular hydrogen bonding. Therefore, the tertiary amines have LOWEST boiling point AMONG the primary and secondary COUNTERPARTS.

Discussion

30.	How many more carbon atoms are present in the amine formed from the reduction of a nitrile, than in the nitrile itself?(a) 0(b) 1(c) 2(d) 1 or 2I got this question in examination.This key question is from Preparation of Amines in section Amines of Chemistry – Class 12
Answer» Correct choice is (a) 0 The best explanation: The -CN GROUP of the nitrile is REDUCED to -CH2-NH2 group. This means that the parent carbon chain of the amine has one more carbon than the parent chain of the nitrile. HOWEVER, the total number of carbons in both compounds is same as one of the carbon in nitriles is present in the cyanide group.

Discussion

31.	Which of the following best describes the amine (CH3CH2)3N?(a) Secondary, simple(b) Secondary, mixed(c) Tertiary, simple(d) Tertiary, mixedThe question was posed to me during an online interview.My query is from Amines Classification topic in chapter Amines of Chemistry – Class 12
Answer» The correct OPTION is (c) Tertiary, simple To EXPLAIN I would say: All the THREE hydrogen atoms of ammonia are replaced by the same ethyl group in (CH3CH2)3N, which MAKES is a 3° simple AMINE.

Discussion

32.	Which of the following is not a classification of amines?(a) Primary(b) Secondary(c) Tertiary(d) QuaternaryThe question was asked in an online interview.I want to ask this question from Amines Classification topic in portion Amines of Chemistry – Class 12
Answer» Correct CHOICE is (d) Quaternary To elaborate: AMINES may be CLASSIFIED as primary, secondary or tertiary depending on whether 1, 2 or 3 hydrogen atoms of NH3 are replaced by alkyl/aryl GROUPS respectively. Quaternary ammonium compounds are a different class of compounds where all four hydrogen atoms of ammonium salts are replaced by alkyl/aryl groups.

Discussion

33.	Benzenediazonium chloride is commercially available in packaged form.(a) True(b) FalseI have been asked this question in an interview for job.I'm obligated to ask this question of Diazonium Salts Physical Properties topic in division Amines of Chemistry – Class 12
Answer» Correct answer is (B) False Explanation: Because of the highly unstable nature of diazonium SALTS, they are not commercially AVAILABLE. Instead, they are prepared on DEMAND.

Discussion

34.	Which of the following properties is suitable for all diazonium salts?(a) Water soluble(b) Coloured solids(c) Explosive(d) UnreactiveThis question was addressed to me in my homework.The question is from Diazonium Salts Physical Properties in section Amines of Chemistry – Class 12
Answer» The correct option is (c) Explosive To explain I would say: Diazonium salts are unstable and MAY explode in DRY state. Therefore, they are generally used in SOLUTION or AQUEOUS state.

Discussion

35.	Why is the reason for the stability of aromatic diazonium salts?(a) Dispersal of negative charge over the benzene ring(b) Dispersal of positive charge over benzene ring(c) Bond between diazonium group and anion(d) High electronegativity of anion compared to the N atomI have been asked this question in an internship interview.This intriguing question originated from Preparation Method of Diazonium Salts topic in division Amines of Chemistry – Class 12
Answer» CORRECT OPTION is (b) Dispersal of positive charge over benzene ring The best I can explain: The stability of benzenediazonium salt is DUE to its resonance structures. In THREE of the resonance structures, the positive charge is DISPERSED over the benzene ring at ortho and para positions.

Discussion

36.	It is possible to obtain para isomers of anilines as the major product in electrophilic ring substitution of aniline.(a) True(b) FalseI had been asked this question by my school teacher while I was bunking the class.My query is from Amines Chemical Reactions topic in division Amines of Chemistry – Class 12
Answer» Correct option is (a) True For explanation: This is possible by protecting the AMINO GROUP of ANILINE by reacting it with ACETIC anhydride (acetylation)to give acetanilide. This compound on desired substitution REACTION followed by hydrolysis gives para substituted aniline as major product.

Discussion

37.	A certain amine ‘X’ when heated with chloroform and alcoholic KOH, produced no reaction. Identify ‘X’ from the following.(a) Methylamine(b) Ethylamine(c) Ethylmethylamine(d) AnilineThis question was posed to me in an interview.This intriguing question comes from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12
Answer» Correct choice is (c) Ethylmethylamine Best explanation: When an amine is heated with CHCl3 and alc. KOH and does not give any reaction, it indicates that it is a SECONDARY or TERTIARY amine. This is called as carbylamines TEST and the compound ‘X’ will be ethylmethylamine, as it is 2° and FAILS the test.

Discussion

38.	Identify the correct order of basic strength of the following substituted anilines?(a) p-Methylaniline > m-Methylaniline > p-Nitroaniline > m-Nitroaniline(b) p-Methylaniline > m-Methylaniline > m-Nitroaniline > p-Nitroaniline(c) p-Nitroaniline > m-Nitroaniline > p-Methylaniline > m-Methylaniline(d) p-Nitroaniline > m-Nitroaniline > m-Methylaniline > p-MethylanilineThe question was posed to me during an interview.This is a very interesting question from Amines Chemical Reactions in chapter Amines of Chemistry – Class 12
Answer» Right choice is (b) p-Methylaniline > m-Methylaniline > m-Nitroaniline > p-Nitroaniline The explanation is: The BASE WEAKENING effect of electron withdrawing group (NO2) and the base strengthening effect of electron DONATING group (CH3) is more prominent at para position than at meta position.

Discussion

39.	If the pKb value of N,N-diethylethanamine is 3.25, predict the pKb value of ethanamine.(a) 3.00(b) 3.29(c) 4.75(d) 9.38This question was posed to me during an online exam.This intriguing question originated from Amines Chemical Reactions in chapter Amines of Chemistry – Class 12
Answer» The correct choice is (b) 3.29 To elaborate: In ethyl substituted amines (aqueous), the inductive effect has a bigger ROLE than the solvation effect (because the size of ethyl is LARGER than METHYL group), and as a result the basic strength of N,N-diethylethanamine will be higher than that of ethanamine. Thus, the PKB value of the latter will be very slightly higher than the FORMER.

Discussion

40.	The best reagent for converting 2-phenylpropanamide to 1-phenylethanamine is ________(a) H2/Ni(b) Na(Hg)/C2H5OH(c) LiAlH4(d) NaOH/Br2I had been asked this question in unit test.This intriguing question originated from Preparation of Amines in division Amines of Chemistry – Class 12
Answer» Correct option is (d) NaOH/Br2 Easiest EXPLANATION: 2-Phenylpropanamide has 9 carbon atoms while 1-phenylethamine has 8 carbon atoms. This depicts stepping down of carbon from AMIDE to AMINE conversion and this takes place in Hoffmann degradation reaction.

Discussion

41.	Which of the following best describes aniline in pure form?(a) Colourless liquid(b) White waxy solid(c) Brown gas(d) Yellowish gasI got this question in quiz.This key question is from Amines Physical Properties topic in section Amines of Chemistry – Class 12
Answer» Correct answer is (a) COLOURLESS liquid To explain: ANILINE and other aryl amines are USUALLY colourless, but they become coloured on STORAGE due to atmospheric OXYGEN. Aniline develops a yellow to brown colour dur to this reason.

Discussion

42.	What is the common name of the simplest aromatic amine?(a) Aniline(b) Benzylamine(c) Benzenamine(d) AminobenzeneThe question was posed to me in a job interview.My enquiry is from Amines Nomenclature in chapter Amines of Chemistry – Class 12
Answer» Right choice is (a) Aniline To explain: The simplest AMINE is C6H5NH2 and is known as aniline. This NAME is also accepted as the IUPAC name. Its actual IUPAC name is benzenamine, or it MAY also be written as aminobenzene.

Discussion

43.	Identify the correct naming of H2NCH2CH2OH.(a) 2-Hydroxyethanamine(b) 2-Aminoethanol(c) Ethane-2-hydroxy-1-amine(d) 1-Aminoethan-2-olThis question was posed to me in a job interview.My enquiry is from Amines Nomenclature topic in division Amines of Chemistry – Class 12
Answer» The correct answer is (B) 2-Aminoethanol Explanation: In case of multiple functional groups, the AMINO group is considered as substituent and the other is regarded as the principle functional group and is given the lower carbon position. In this case, the COMPOUND is named as a derivative of ethanol.

Discussion

44.	Which of the following is a primary arylalkyl amine?(a) CH3NH2(b) C6H5CH2NH2(c) C6H5NH2(d) (C6H5)2NHI have been asked this question in exam.Origin of the question is Amines Classification topic in division Amines of Chemistry – Class 12
Answer» Right ANSWER is (b) C6H5CH2NH2 Easy explanation: SINCE it should be PRIMARY, it should have an alkyl/aryl group attached to the NH2 molecule, and because it is ARYLALKYL, the nitrogen should be linked to an sp^3 hybridised benzyl carbon rather than to an aryl carbon.

Discussion

45.	The IUPAC name of allylamine is prop-2-en-1-amine.(a) True(b) FalseThis question was posed to me in exam.Question is from Amines Nomenclature in portion Amines of Chemistry – Class 12
Answer» Correct option is (a) True The best explanation: Allylamine (NH2-CH2-CH=CH2) is an unsaturated amine with the amino GROUP attached to an ALLYL CARBON. In such compounds, the amino group is given preference and HENCE the double bond lies at the second carbon.

Discussion

46.	Aromatic amines cannot have an alkyl group attached to N atom.(a) True(b) FalseThis question was addressed to me in homework.This interesting question is from Amines Classification in portion Amines of Chemistry – Class 12
Answer» CORRECT CHOICE is (B) False To elaborate: There can be an alkyl group attached to an AROMATIC amine, but at least one of the substituents should be a phenyl group in aryl amine. For arylalkyl amines (which are also aromatic), the benzene ring is not directly linked to the nitrogen.

Discussion

47.	Benzylamine is an aryl amine.(a) True(b) FalseThis question was posed to me in an internship interview.The above asked question is from Amines Classification in portion Amines of Chemistry – Class 12
Answer» Correct option is (B) False Easy EXPLANATION: Aryl amines are aromatic amines in which the nitrogen ATOM is directly bonded to the benzene ring. Whereas in benzylamine (C6H5CH2NH2), the nitrogen is ATTACHED to the side chain of the aromatic ring. Hence, it is an arylalkyl AMINE.

Discussion

48.	Which gas is produced when ethanamine reacts with nitrous acid?(a) N2(b) H2(c) HCl(d) O2I had been asked this question during an online exam.This is a very interesting question from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12
Answer» CORRECT option is (a) N2 For explanation: NITROGEN gas is EVOLVED due to the decomposition of diazonium salts which are formed from the reaction of 1° aliphatic AMINES with HNO2. This is used in the ESTIMATION of amino acids and proteins.

Discussion

49.	Identify the diazonium group in the diazonium salt ArN2^+Br-.(a) ArN2^+(b) N2^+Br^–(c) N2^+(d) ArN2BrI got this question in final exam.The question is from Preparation Method of Diazonium Salts in division Amines of Chemistry – Class 12
Answer» Correct OPTION is (c) N2^+ The best explanation: The Ar REPRESENTS the aromatic ring and Br^– is the NEGATIVE ion that forms the SALT by combining with the diazonium GROUP, N2^+.

Discussion

50.	Identify X if the shown compound has a higher pKb value than aniline.(a) OH(b) CH3(c) NH2(d) ClThe question was asked in final exam.Asked question is from Amines Chemical Reactions in chapter Amines of Chemistry – Class 12
Answer» RIGHT answer is (d) Cl The best I can EXPLAIN: The compound has a higher PKB value than aniline means that it has a lower acidic strength than aniline. This is possible is X is an electron withdrawing group (Cl) that destabilizes the anilinium CATION and REDUCES the basic strength.

Discussion

Explore topic-wise InterviewSolutions in .

Benzenediazonium chloride is ______ in water.(a) slightly soluble(b) highly soluble(c) insoluble(d) highly insolubleI got this question by my school teacher while I was bunking the class.Question is taken from Diazonium Salts Physical Properties in section Amines of Chemistry – Class 12

Aliphatic diazonium salts are highly unstable.(a) True(b) FalseThe question was asked in unit test.My doubt stems from Preparation Method of Diazonium Salts in section Amines of Chemistry – Class 12

Aniline is insoluble in which of the following solvents?(a) Ethanol(b) Ethoxyethane(c) Benzene(d) WaterThe question was asked in an interview for job.This interesting question is from Amines Physical Properties topic in chapter Amines of Chemistry – Class 12

In the IUPAC system, the prefix N^– is generally used for _______ amines.(a) primary(b) secondary(c) tertiary(d) secondary and tertiaryI had been asked this question in final exam.The question is from Amines Nomenclature topic in portion Amines of Chemistry – Class 12

Which of the following is an arylalkyl amine?(a) C6H5NHC6H5(b) C6H5NH2(c) (C6H5CH2)NH(d) (C6H5)3NI got this question in a job interview.This intriguing question originated from Amines Classification topic in portion Amines of Chemistry – Class 12

Which of the following compounds has to be used in Gatterman reaction?(a) Chloroform(b) HCl(c) Copper powder(d) Copper chlorideThe question was posed to me in semester exam.I'd like to ask this question from Diazonium Salts Chemical Reactions in chapter Amines of Chemistry – Class 12

Identify Y in the following reaction.(a) Cu2Cl2/KCN(b) CuCN/KCN(c) Cu2Cl2/HCN(d) CuCN/HCNThis question was addressed to me during a job interview.Asked question is from Diazonium Salts Chemical Reactions in chapter Amines of Chemistry – Class 12

Which of the following cannot be formed from Sandmeyer reaction on benzenediazonium chloride?(a) Chlorobenzene(b) Bromobenzene(c) Iodobenzene(d) BenzonitrileThe question was posed to me in my homework.My enquiry is from Diazonium Salts Chemical Reactions in section Amines of Chemistry – Class 12

Aniline on carbylamines test gives an unpleasant foul odour.(a) True(b) FalseI had been asked this question in semester exam.Enquiry is from Amines Chemical Reactions in section Amines of Chemistry – Class 12

Which of the following groups when present at para position increases the basic strength of aniline?(a) NO2(b) Br(c) NH2(d) COOHThis question was posed to me in exam.My question is from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12

Which of the following is a 2° amine?(a) CH3CH2NHCH3(b) (CH3)3N(c) (CH3CH2CH2)2NCH3(d) C6H5NH2The question was asked in quiz.Asked question is from Amines Classification topic in section Amines of Chemistry – Class 12

Which of the following amines is not a gas?(a) Methylamine(b) Dimethylamine(c) Ethylamine(d) TrimethylamineI got this question in examination.My query is from Amines Physical Properties in section Amines of Chemistry – Class 12

What is the C-N-C bond angle in the following compound?(a) 107°(b) 108°(c) 109°(d) 109.5°I have been asked this question by my college professor while I was bunking the class.The question is from Structure of Amines in section Amines of Chemistry – Class 12

Which of the following is not an amine?(a) NH3(b) CH3NH2(c) C6H5NH2(d) CH3NHCH3This question was posed to me during an interview.My question comes from Structure of Amines topic in portion Amines of Chemistry – Class 12

p-Iodonitrobenzene can be synthesized from p-nitroaniline.(a) True(b) FalseThis question was addressed to me in an international level competition.My question is based upon Diazonium Salts in Synthesis of Aromatic Compounds in portion Amines of Chemistry – Class 12

Which of the following amines are insoluble in water?(a) Methanamine(b) Ethanamine(c) Propanamine(d) BenzenamineThe question was asked in examination.Origin of the question is Amines Physical Properties topic in section Amines of Chemistry – Class 12

If the boiling point of diethylamine is 329 K, predict the boiling point of ethyldimethylamine.(a) 310 K(b) 329 K(c) 340 K(d) 351 KThis question was addressed to me in examination.The above asked question is from Amines Physical Properties in section Amines of Chemistry – Class 12

How many more carbon atoms are present in the amine formed from the reduction of a nitrile, than in the nitrile itself?(a) 0(b) 1(c) 2(d) 1 or 2I got this question in examination.This key question is from Preparation of Amines in section Amines of Chemistry – Class 12

Which of the following best describes the amine (CH3CH2)3N?(a) Secondary, simple(b) Secondary, mixed(c) Tertiary, simple(d) Tertiary, mixedThe question was posed to me during an online interview.My query is from Amines Classification topic in chapter Amines of Chemistry – Class 12

Which of the following is not a classification of amines?(a) Primary(b) Secondary(c) Tertiary(d) QuaternaryThe question was asked in an online interview.I want to ask this question from Amines Classification topic in portion Amines of Chemistry – Class 12

Benzenediazonium chloride is commercially available in packaged form.(a) True(b) FalseI have been asked this question in an interview for job.I'm obligated to ask this question of Diazonium Salts Physical Properties topic in division Amines of Chemistry – Class 12

Which of the following properties is suitable for all diazonium salts?(a) Water soluble(b) Coloured solids(c) Explosive(d) UnreactiveThis question was addressed to me in my homework.The question is from Diazonium Salts Physical Properties in section Amines of Chemistry – Class 12

If the pKb value of N,N-diethylethanamine is 3.25, predict the pKb value of ethanamine.(a) 3.00(b) 3.29(c) 4.75(d) 9.38This question was posed to me during an online exam.This intriguing question originated from Amines Chemical Reactions in chapter Amines of Chemistry – Class 12

The best reagent for converting 2-phenylpropanamide to 1-phenylethanamine is ________(a) H2/Ni(b) Na(Hg)/C2H5OH(c) LiAlH4(d) NaOH/Br2I had been asked this question in unit test.This intriguing question originated from Preparation of Amines in division Amines of Chemistry – Class 12

Which of the following best describes aniline in pure form?(a) Colourless liquid(b) White waxy solid(c) Brown gas(d) Yellowish gasI got this question in quiz.This key question is from Amines Physical Properties topic in section Amines of Chemistry – Class 12

What is the common name of the simplest aromatic amine?(a) Aniline(b) Benzylamine(c) Benzenamine(d) AminobenzeneThe question was posed to me in a job interview.My enquiry is from Amines Nomenclature in chapter Amines of Chemistry – Class 12

Identify the correct naming of H2NCH2CH2OH.(a) 2-Hydroxyethanamine(b) 2-Aminoethanol(c) Ethane-2-hydroxy-1-amine(d) 1-Aminoethan-2-olThis question was posed to me in a job interview.My enquiry is from Amines Nomenclature topic in division Amines of Chemistry – Class 12

Which of the following is a primary arylalkyl amine?(a) CH3NH2(b) C6H5CH2NH2(c) C6H5NH2(d) (C6H5)2NHI have been asked this question in exam.Origin of the question is Amines Classification topic in division Amines of Chemistry – Class 12

The IUPAC name of allylamine is prop-2-en-1-amine.(a) True(b) FalseThis question was posed to me in exam.Question is from Amines Nomenclature in portion Amines of Chemistry – Class 12

Aromatic amines cannot have an alkyl group attached to N atom.(a) True(b) FalseThis question was addressed to me in homework.This interesting question is from Amines Classification in portion Amines of Chemistry – Class 12

Benzylamine is an aryl amine.(a) True(b) FalseThis question was posed to me in an internship interview.The above asked question is from Amines Classification in portion Amines of Chemistry – Class 12

Which gas is produced when ethanamine reacts with nitrous acid?(a) N2(b) H2(c) HCl(d) O2I had been asked this question during an online exam.This is a very interesting question from Amines Chemical Reactions topic in portion Amines of Chemistry – Class 12

Identify the diazonium group in the diazonium salt ArN2^+Br-.(a) ArN2^+(b) N2^+Br^–(c) N2^+(d) ArN2BrI got this question in final exam.The question is from Preparation Method of Diazonium Salts in division Amines of Chemistry – Class 12

Identify X if the shown compound has a higher pKb value than aniline.(a) OH(b) CH3(c) NH2(d) ClThe question was asked in final exam.Asked question is from Amines Chemical Reactions in chapter Amines of Chemistry – Class 12