361 + Interview Questions in AMINES IN GENERAL AWARENESS Page 2 InterviewSolution

51.	Identify ‘B’ in the following reactions
Answer» Correct answer is d. CH₃ -CH₂ -OH

51.

Identify ‘B’ in the following reactions

Answer»

Correct answer is

d. CH₃ -CH₂ -OH

52.	Hoffmann-Bromamide reaction has the following mechanism Reagent used in reaction I is:A. `Br_(2)+KOH`B. `KBr+NaOH`C. `NBS`D. `KBr + NaHCO_(3)`
Answer» Correct Answer - A

Discussion

53.	Which of the following is formed when acetonitrile is hydrolysed partially with cold conc `HCI` ? .A. Acetic anhydrideB. Acetic acidC. Mehty1 cyanideD. Acetamide
Answer» Correct Answer - D Partial hydrolysis of alky1 cyanide yields the corresponding acid amide `CH_(3)C-=N overset("Conc.cold HCI")rarrunderset("acetamide")(CH_(3)CONH_(2))` .

Discussion

54.	Which of the following is formed when acetonitrile is hydrolysed partially with cold conc `HCI` ? .A. Acetic acidB. AcetamideC. Methyl cyanideD. Acetic anhydride
Answer» Correct Answer - B The partial hydrolysis of alkyl cyanides with cold conc. HCl or `H_(2)SO_(4)` gives amides. `underset("Alkylcyanides")(CH_(3)-C)-=N underset(H_(2)O // OH^(-))overset(Conc. HCl)to underset("Acetamide")(CH_(3)CONH_(2))`

Discussion

55.	Assign a reason for the following statements: Alkylamines are stronger bases than arylamines.
Answer» Alkylamines are stronger bases than arylamines because alkyl group in alkylamine are electron releasing but anyl group in arylamine is electron withdrawing. Moreover, the lone pair of electrons on N in aromatic amine is delocalised due to resonance with benzene ring.

Discussion

56.	Which of the following is least basic . ?A. o-AnisidineB. p-AnisidineC. m-AnisidineD. Aniline
Answer» Correct Answer - C Methoxy `(CH_(3O))` group of anisidine is strongly electron donating fron the ortho and para positions by extended `pi` bonding This effect completely dominates the electron -withdrawing inductive effect form these positions Therefore we expect o-and p-anisidines to be stronger bases than anline but hte correct order of basicity is p-Anisidine gtaniline gt o-Anisidine o-Anisidine is weaker than aniline on account of ortho effect All o-substituted anilines are less basic than p-substitude anilines regrrdless of the electronic effect of the substituent THis effect is attributed to stric hindrance by the o-substituent to solvation of the cation This steric effect destabilizes the cation making the amine a weaker base m-Anisidine is the cation making the amine a weaker base m-Anisidine is the weakest base because `m-CH_(3)O` group is electron withdrawing in nature on account of -I effect Note the there is no resonance effect at the meta position .

Discussion

57.	The one which is the least basicA. `NH_(3)`B. `C_(6)H_(5)NH_(2)`C. `(C_(6)H_(5))_(3)N`D. `(C_(6)H_(5))_(2)NH`
Answer» Correct Answer - C

Discussion

58.	How can you distinguish between p-chloro aniline and anilinium hydrochloride ?
Answer» Anilinium hydrochloride will give a white ppt. of AgCl with AgNO_3(aq) while p-Chloroaniline will not react with AgNO_3(aq₎ .

Discussion

59.	Reaction of nitrous acid with aliphatic primary amine in the cold givesA. A diazonium saltB. An alcoholC. A nitrateD. A dye
Answer» Correct Answer - B

Discussion

60.	The presence of primary amine can be confirmed by its reaction with:A. `HNO_(2)`B. `CHCI_(3) +NaOH`C. `CS_(2)` and `HgCI_(2)`D. `H_(2)SO_(4)`
Answer» Correct Answer - A::B::C

Discussion

61.	The presence of a primary amine can be confirmed by its reaction with .A. `CHCI_(3)` and `KOH`B. `HNO_(2)`C. `CS_(2)` and `HgCI_(2)`D. Both (1) and (3)
Answer» Correct Answer - D Only primary amines respond to carbylamine test `(CS_(2))` and `HgCI_(2)`

Discussion

62.	Which of the following is known as Hinsberg reagent ?A. `C_(6)H_(5)SO_(3)H`B. `C_(2)H_(5)NO`C. `C_(6)H_(5)SO_(2)CI`D. `C_(6)H_(5)N_(2)CI`
Answer» Correct Answer - C Benzenesulphony1 chloride `(C_(6)H_(5)SO_(2)CI)` is called Hinsberg reagent because it is used in Hinsberg test to disinguish three types of amines .

Discussion

63.	Which of the following is known as Hinsberg reagent ?A. `C_(6)H_(5)SO_(2)CI`B. `C_(6)H_(5)SO_(3)H`C. `C_(6)H_(5)COCI`D. `C_(6)H_(5)NH_(2)`
Answer» Correct Answer - A Benzenesulphony1 chloride `(C_(6)H_(5)SO_(2)CI)` is known as Hinsberg reagent It reacts with primary and secondary amines to form sulphonamides .

Discussion

64.	Which of the following reagents is used for the Hinsberg method to separate amines ? .A. `CH_(3)SO_(2)CI`B. `C_(6)H_(5)COCI`C. `CH_(3)COCI`D. `C_(6)H_(5)SO_(2)CI`
Answer» Correct Answer - D Benzenesulphony1 chloride `(C_(6)H_(5)SO_(2)Cl)` which is also known as Hinsberg s reagent reacts with primary and secondary amines to form sulphoamides .

Discussion

65.	Which of the following compounds on being heated with a primary amine and alcoholic `KOH` will form a carbylamine ? .A. `C CI_(4)`B. `CHCI_(3)`C. `CH_(2)CI_(2)`D. `CH_(3)CI`
Answer» Correct Answer - B Aliphatic as well as aromatic primary amines form carbylamines (or isocyanides) when heated with chloroform and ethanolic postassium hydroxide. `overset(RNH_(2))underset(AgNH_(2))(or)+CHCl_(3)+3KOH overset("ethanol")underset(Delta)rarr overset(RNC)underset("Carbylamine")underset(ArNC)(or)+3KCl+3H_(2)O`

Discussion

66.	A compound (X) has the molecular formula ` C_7 H_7O` . On treatment with ` Br_2` and ` KOH`. (X) gives an amine (Y) , (Y) gives carbylamine lest . (Y) upon diazotisation and couupling with phenol gives an azodye (Z ) .(X) is :A. `C_(6)H_(5)CONH_(2)`B. `C_(6)H_(5)CH_(2)NO`C. `C_(6)H_(5)COONH_(4)`D. All of these
Answer» Correct Answer - A

Discussion

67.	Give one chemical test to distinguish between CH3CH2NH2 and C6H5NH2.
Answer» Azo dye test: Dissolve the compound in conc. HCl and ice-cold solution of HNO₂ (NaNO₂ + dil. HCI) and then treat it with an alkaline solution of 2-naphthol. Appearance of brilliant orange or red dye indicates aniline. Ethyl amine does not give dye test.

67.

Give one chemical test to distinguish between CH3CH2NH2 and C6H5NH2.

Answer»

Azo dye test: Dissolve the compound in conc. HCl and ice-cold solution of HNO₂ (NaNO₂ + dil. HCI) and then treat it with an alkaline solution of 2-naphthol. Appearance of brilliant orange or red dye indicates aniline.

Ethyl amine does not give dye test.

Discussion

68.	Which of the following give Schiff base with aldehyde?A. `CH_(3)CH_(2)NH_(2)`B. `C_(6)H_(5)-CH_(2)-NH_(2)`C. `C_(6)H_(5)-NH_(2)`D. `C_(6)H_(5)-NO_(2)`
Answer» Correct Answer - A::B::C

Discussion

69.	Which of the following compounds will not form a Schiff base on reaction with p-nitrobenzaldehyde .A. B. C. D.
Answer» Correct Answer - A Only primary amines react with aldehydes or ketones to form Schiff bases Compound (1) is a secondary amine .

Discussion

70.	Amines are highly soluble inA. `(C)Cl_(4)`B. Diethyl etherC. BenzeneD. Water
Answer» Correct Answer - D

Discussion

71.	Treatment of ammonia with excess of ethyl chloride will yeildA. DiethylamineB. MethylamineC. Tetra ethyl ammonium chlorideD. Ethane
Answer» Correct Answer - C

Discussion

72.	Identify product D in the following sequence: A. `CH_(3)underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(2)C)-=N`B. `CH_(3)underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(2)CH_(2)N(CH_(3))_(2)`C. `CH_(3)underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(2)N(CH_(3))_(2)`D. `CH_(3)underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(2))underset(OH)underset(\|)CHN(CH_(3))_(2)`
Answer» Correct Answer - B (A) `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-CH_(2)-overset(O)overset(\|\|)C-O-H` b) `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-CH_(2)-overset(O)overset(\|\|)C-Cl` C) `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-CH_(2)-overset(O)overset(\|\|)C-underset(CH_(3))underset(\|)N-CH_(3)` d) `CH_(3)-overset(CH_(3))overset(\|)underset(CH_(3))underset(\|)C-CH_(2)-CH_(2)-Noverset(CH_(3))overset(/)underset(CH_(3))underset(\)`

Discussion

73.	How many moles of methylbromide are required to convert ethanamine to N, Ndimethyl ethanamine?
Answer» 2 moles of methylbromide are required to convert ethanamine to N, N-dimethyl ethanamine.

Discussion

74.	Arrange the following in the increasing order of their basic character in an aqueous solution :C2H5NH2, (C2H5)NH,(C2H5)3N
Answer» C₂H₅NH₂ < (C₂H₅)₃N < (C₂H₅)₂NH

Discussion

75.	When alkyl halide is treated with alkali metal cyanide, cyanides are obtained as the major product. Assume that AgCN is used instead of NaCN.1. What will be the product? 2. Justify.
Answer» 1. Isocyanide 2. Silver cyanide is predominantly covalent. Hence nitrogen atom is free to donate electron pair forming isocyanide as the main product.

75.

When alkyl halide is treated with alkali metal cyanide, cyanides are obtained as the major product. Assume that AgCN is used instead of NaCN.1. What will be the product? 2. Justify.

Answer»

1. Isocyanide

2. Silver cyanide is predominantly covalent. Hence nitrogen atom is free to donate electron pair forming isocyanide as the main product.

Discussion

76.	The compound `X(C_(7)H_(9)N)` reacts with benzensulfonyl chloride to give `Y(C_(13)H_(13)NO_(2)S)` which is insoluble in alkali. The compound X is-A. B. C. D.
Answer» Correct Answer - A

Discussion

77.	P and Q respectively.A. B. C. D.
Answer» Correct Answer - D

Discussion

78.	Which are related with Curtius rearrangement?A. `NaN_(3)`B. `R-NH_(2)`C. `R-overset(O)overset(\|\|)(C)-CI`D. `R-overset(O)overset(\|\|)(C)-OH`
Answer» Correct Answer - A::B::C

Discussion

79.	The `NH_(2)` group of aniline acts as a / an ________ in electropilic aromatic substitution .A. deactivator and meta directorB. activator and ortho para directorC. activator and meta directorD. deactivator and ortho para director
Answer» Correct Answer - B On account of resonance (+Reffect) the ortho and para positions to the `- NH_(2)` group become centres of high electron density Therefore `-NH_(2)` group acts as a powerful activator and ortho para director .

Discussion

80.	Which of the following is most basic ?A. `C_(6)H_(5)NH_(2)`B. `(C_(6)H_(5))_(2)NH`C. `CH_(3)NH_(2)`D. `(CH_(3))_(2)NH`
Answer» Correct Answer - D Relative to aromic amines aliphatic amines are more basic In aqueous solution as well as gas phase `2^(@)` amines are most basic Thus the correct order of basic strenght is `(CH_(3))_(2)gtCH_(3)NH_(2)gtC_(6)H_(5)NH_(2)gt(C_(6)H_(5))_(2)NH` .

Discussion

81.	Which one of the following compounds contains azo linkage? a. Hydrazine b. p-Hydroxyazobenzene c. N-Nitrosodiethylamine d. Ethylenediamine
Answer» Correct answer is b. p-Hydroxyazobenzene

81.

Which one of the following compounds contains azo linkage? a. Hydrazine b. p-Hydroxyazobenzene c. N-Nitrosodiethylamine d. Ethylenediamine

Answer»

Correct answer is

b. p-Hydroxyazobenzene

Discussion

82.	An aqueous solution of primary amine contains :(a) R-N+H3OH-(c) R-N+H2OH-(d) both (a) and (b)
Answer» Option : (d) both (a) and (b)

Discussion

83.	The basic nature of amines in an aqueous solution is in the order of :(a) tert. > sec. > pri. (b) sec. > pri. > tert. (c) pri. > sec. > tert. (d) pri. > tert. > sec.
Answer» Option : (b) sec. > pri. > tert.

Discussion

84.	In trimethyl ammonium ion, the number of sigma bonds attached to nitrogen are :(a) 2 (b) 3 (c) 4 (d) 5
Answer» Option : (b) 3

Discussion

85.	The number of electrons in the valence shell of nitrogen in methyl amine is :(a) 5(b) 3 (c) 8 (d) 7
Answer» Option : (c) 8

Discussion

86.	In Gabriel synthesis, amine is always:A. alphatic primary amineB. aliphatic secondary amineC. aromatic primary amineD. aromatic secondary amine
Answer» Correct Answer - A

Discussion

87.	In the path I, if then the amine finally formed is :A. B. C. racemic mixture of a and bD. none of these
Answer» Correct Answer - B

Discussion

88.	The source of nitrogen in Gabriel synthesis of amines is _____________.(i) Sodium azide, NaN3(ii) Sodium nitrite, NaNO2(iii) Potassium cyanide, KCN(iv) Potassium phthalimide, C6H4(CO)2N–K+
Answer» (iv) Potassium phthalimide, C₆H₄(CO)₂N–K⁺

Discussion

89.	Amongst the given set of reactants, the most appropriate for preparing 2° amine is _____.(i) 2° R—Br + NH3(ii) 2° R—Br + NaCN followed by H2/Pt(iii) 1° R—NH2 + RCHO followed by H2/Pt(iv) 1° R—Br (2 mol) + potassium phthalimide followed by H3O+/heat
Answer» (iii) 1° R—NH₂ + RCHO followed by H₂/Pt

Discussion

90.	The end product of the following reaction is: A. B. C. D.
Answer» Correct Answer - A

Discussion

91.	Consider path II, choose the major product for 1 and 2: A. `1-Y, 2-X`B. `1-X,2-Y`C. `1-X,2-X`D. `1-Y,2-Y`
Answer» Correct Answer - A

Discussion

92.	The major product of the reaction: A. B. C. D.
Answer» Correct Answer - D

Discussion

93.	Identify the major product of following reaction: A. B. C. D. none of these
Answer» Correct Answer - C

Discussion

94.	Identify major product of following sequence of reaction: A. B. C. D.
Answer» Correct Answer - C

Discussion

95.	What set of conditions would be useful for preparing a `2^(@)` amine?A. `2^(@)R-Br +NaNH_(2)`B. `2^(2)R-Br + NaN_(3),H_(2)//Pt`C. `1^(@)R-NH_(2)+1^(@)RCHO,H_(2)` and `Pt`D.
Answer» Correct Answer - C

Discussion

96.	Which of the following amines reacts most rapidly with A. B. C. D.
Answer» Correct Answer - D

Discussion

97.	Identfy A and B in the following reactions.
Answer» Complete conversion can be performed as `(#ARH_NCERT_EXE_CHM_XII_C13_S01_058_S01.png" width="80%">

Discussion

98.	Bromine water reacts with aniline to giveA. o-BromoanilineB. m-BromoanilineC. p-BromoanilineD. 2,4,6- Tribromoanline
Answer» Correct Answer - D

Discussion

99.	How many hydrogen atoms are required for the reduction of 1-nitropropane to n-propyl amine?(a) Four (b) Three (c) Six (d) Two
Answer» Option : (c) Six

Discussion

100.	Identify X in the series A. B. C. D.
Answer» Correct Answer - B

Discussion

Explore topic-wise InterviewSolutions in .

Identify ‘B’ in the following reactions

Hoffmann-Bromamide reaction has the following mechanism Reagent used in reaction I is:A. `Br_(2)+KOH`B. `KBr+NaOH`C. `NBS`D. `KBr + NaHCO_(3)`

Which of the following is formed when acetonitrile is hydrolysed partially with cold conc `HCI` ? .A. Acetic anhydrideB. Acetic acidC. Mehty1 cyanideD. Acetamide

Which of the following is formed when acetonitrile is hydrolysed partially with cold conc `HCI` ? .A. Acetic acidB. AcetamideC. Methyl cyanideD. Acetic anhydride

Assign a reason for the following statements: Alkylamines are stronger bases than arylamines.

Which of the following is least basic . ?A. o-AnisidineB. p-AnisidineC. m-AnisidineD. Aniline

The one which is the least basicA. `NH_(3)`B. `C_(6)H_(5)NH_(2)`C. `(C_(6)H_(5))_(3)N`D. `(C_(6)H_(5))_(2)NH`

How can you distinguish between p-chloro aniline and anilinium hydrochloride ?

Reaction of nitrous acid with aliphatic primary amine in the cold givesA. A diazonium saltB. An alcoholC. A nitrateD. A dye

The presence of primary amine can be confirmed by its reaction with:A. `HNO_(2)`B. `CHCI_(3) +NaOH`C. `CS_(2)` and `HgCI_(2)`D. `H_(2)SO_(4)`

The presence of a primary amine can be confirmed by its reaction with .A. `CHCI_(3)` and `KOH`B. `HNO_(2)`C. `CS_(2)` and `HgCI_(2)`D. Both (1) and (3)

Which of the following is known as Hinsberg reagent ?A. `C_(6)H_(5)SO_(3)H`B. `C_(2)H_(5)NO`C. `C_(6)H_(5)SO_(2)CI`D. `C_(6)H_(5)N_(2)CI`

Which of the following is known as Hinsberg reagent ?A. `C_(6)H_(5)SO_(2)CI`B. `C_(6)H_(5)SO_(3)H`C. `C_(6)H_(5)COCI`D. `C_(6)H_(5)NH_(2)`

Which of the following reagents is used for the Hinsberg method to separate amines ? .A. `CH_(3)SO_(2)CI`B. `C_(6)H_(5)COCI`C. `CH_(3)COCI`D. `C_(6)H_(5)SO_(2)CI`

Which of the following compounds on being heated with a primary amine and alcoholic `KOH` will form a carbylamine ? .A. `C CI_(4)`B. `CHCI_(3)`C. `CH_(2)CI_(2)`D. `CH_(3)CI`

Give one chemical test to distinguish between CH3CH2NH2 and C6H5NH2.

Which of the following give Schiff base with aldehyde?A. `CH_(3)CH_(2)NH_(2)`B. `C_(6)H_(5)-CH_(2)-NH_(2)`C. `C_(6)H_(5)-NH_(2)`D. `C_(6)H_(5)-NO_(2)`

Which of the following compounds will not form a Schiff base on reaction with p-nitrobenzaldehyde .A. B. C. D.

Amines are highly soluble inA. `(C)Cl_(4)`B. Diethyl etherC. BenzeneD. Water

Treatment of ammonia with excess of ethyl chloride will yeildA. DiethylamineB. MethylamineC. Tetra ethyl ammonium chlorideD. Ethane

How many moles of methylbromide are required to convert ethanamine to N, Ndimethyl ethanamine?

Arrange the following in the increasing order of their basic character in an aqueous solution :C2H5NH2, (C2H5)NH,(C2H5)3N

When alkyl halide is treated with alkali metal cyanide, cyanides are obtained as the major product. Assume that AgCN is used instead of NaCN.1. What will be the product? 2. Justify.

The compound `X(C_(7)H_(9)N)` reacts with benzensulfonyl chloride to give `Y(C_(13)H_(13)NO_(2)S)` which is insoluble in alkali. The compound X is-A. B. C. D.

P and Q respectively.A. B. C. D.

Which are related with Curtius rearrangement?A. `NaN_(3)`B. `R-NH_(2)`C. `R-overset(O)overset(||)(C)-CI`D. `R-overset(O)overset(||)(C)-OH`

The `NH_(2)` group of aniline acts as a / an ________ in electropilic aromatic substitution .A. deactivator and meta directorB. activator and ortho para directorC. activator and meta directorD. deactivator and ortho para director

Which of the following is most basic ?A. `C_(6)H_(5)NH_(2)`B. `(C_(6)H_(5))_(2)NH`C. `CH_(3)NH_(2)`D. `(CH_(3))_(2)NH`

Which one of the following compounds contains azo linkage? a. Hydrazine b. p-Hydroxyazobenzene c. N-Nitrosodiethylamine d. Ethylenediamine

An aqueous solution of primary amine contains :(a) R-N+H3OH-(c) R-N+H2OH-(d) both (a) and (b)

The basic nature of amines in an aqueous solution is in the order of :(a) tert. &gt; sec. &gt; pri. (b) sec. &gt; pri. &gt; tert. (c) pri. &gt; sec. &gt; tert. (d) pri. &gt; tert. &gt; sec.

In trimethyl ammonium ion, the number of sigma bonds attached to nitrogen are :(a) 2 (b) 3 (c) 4 (d) 5

The number of electrons in the valence shell of nitrogen in methyl amine is :(a) 5(b) 3 (c) 8 (d) 7

In Gabriel synthesis, amine is always:A. alphatic primary amineB. aliphatic secondary amineC. aromatic primary amineD. aromatic secondary amine

In the path I, if then the amine finally formed is :A. B. C. racemic mixture of a and bD. none of these

The source of nitrogen in Gabriel synthesis of amines is _____________.(i) Sodium azide, NaN3(ii) Sodium nitrite, NaNO2(iii) Potassium cyanide, KCN(iv) Potassium phthalimide, C6H4(CO)2N–K+

Amongst the given set of reactants, the most appropriate for preparing 2° amine is _____.(i) 2° R—Br + NH3(ii) 2° R—Br + NaCN followed by H2/Pt(iii) 1° R—NH2 + RCHO followed by H2/Pt(iv) 1° R—Br (2 mol) + potassium phthalimide followed by H3O+/heat

The end product of the following reaction is: A. B. C. D.

Consider path II, choose the major product for 1 and 2: A. `1-Y, 2-X`B. `1-X,2-Y`C. `1-X,2-X`D. `1-Y,2-Y`

The major product of the reaction: A. B. C. D.

Identify the major product of following reaction: A. B. C. D. none of these

Identify major product of following sequence of reaction: A. B. C. D.

What set of conditions would be useful for preparing a `2^(@)` amine?A. `2^(@)R-Br +NaNH_(2)`B. `2^(2)R-Br + NaN_(3),H_(2)//Pt`C. `1^(@)R-NH_(2)+1^(@)RCHO,H_(2)` and `Pt`D.

Which of the following amines reacts most rapidly with A. B. C. D.

Identfy A and B in the following reactions.

Bromine water reacts with aniline to giveA. o-BromoanilineB. m-BromoanilineC. p-BromoanilineD. 2,4,6- Tribromoanline

How many hydrogen atoms are required for the reduction of 1-nitropropane to n-propyl amine?(a) Four (b) Three (c) Six (d) Two

Identify X in the series A. B. C. D.

The basic nature of amines in an aqueous solution is in the order of :(a) tert. > sec. > pri. (b) sec. > pri. > tert. (c) pri. > sec. > tert. (d) pri. > tert. > sec.