23 + Interview Questions in ORGANIC COMPOUNDS IN GENERAL AWARENESS Page 1 InterviewSolution

1.	The major product of the reaction of methylamine with Tilden reagent is(a) CH3OH(b) CH3CHO(c) CH3Cl(d) CH3COOH
Answer» The answer is (a) CH₃OH

Discussion

2.	Write the general formula of alcohol.
Answer» C_nH_2n+1OH or R – OH.

Discussion

3.	Write the general formula of ether.
Answer» R – O – R’ where R = R’ in simple ethers while R ≠ R’ in mixed ethers.

Discussion

4.	What is the effect of electron withdrawing groups on the acidity of phenol?
Answer» When an electron withdrawing group like the nitro group is present on the benzene ring, the acidic strength of phenol increases. When these groups are present at ortho and para positions then their effect is more because delocalisation of negative charge is more effective in peroxide ion.

Discussion

5.	Write the order of acidity for primary, secondary and tertiary alcohols.
Answer» Primary (1°) > Secondary (2°) > Tertiary (3°).

Discussion

6.	Write the IUPAC name of ethyl alcohol.
Answer» The IUPAC name of ethyl alcohol is Ethanol.

Discussion

7.	Write the IUPAC name of Isobutyraldehyde.
Answer» (CH₃ )₂CH – COOH: Isobutyraldehyde

Discussion

8.	Write the IUPAC name of Acetaldehyde.
Answer» CH₃CHO: Ethanal Acetaldehyde (systematic name ethanal) is an organic chemical compound with the formula CH3CHO, sometimes abbreviated by chemists as MeCHO (Me = methyl). It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale in industry.

8.

Write the IUPAC name of Acetaldehyde.

Answer»

CH₃CHO: Ethanal

Acetaldehyde (systematic name ethanal) is an organic chemical compound with the formula CH3CHO, sometimes abbreviated by chemists as MeCHO (Me = methyl). It is one of the most important aldehydes, occurring widely in nature and being produced on a large scale in industry.

Discussion

9.	Which of the following method is used for conversion of the ketone to hydrocarbon?(a) Aldo condensation(b) Wolf-Kishner Reduction(c) Cannizzaro’s Reaction(d) Clemmenson Reduction
Answer» (b) Wolf-Kishner Reduction

Discussion

10.	Aldehyde and ketones do not react with(a) Sodium bisulphide(b) Phenylhydrazine(c) Dihydrogen sodium phosphate(d) Semicarbazide
Answer» (c) Dihydrogen sodium phosphate

Discussion

11.	What is Tollen’s reagent?
Answer» Ammonical silver nitrate solution is known as Tollen’s reagent. Tollen's reagent ([Ag(NH3)2]+)→ Tollens' reagent is a chemical reagent used to determine the presence of an aldehyde, aromatic aldehyde and alpha-hydroxy ketone functional groups. The reagent consists of a solution of silver nitrate and ammonia.

Discussion

12.	Write the name of one aldehyde which does not give Fehling’s test.
Answer» Aromatic aldehydes such as benzaldehyde do not give Fehling’s test.

Discussion

13.	Which of the following cannot be synthesised by Stephen’s reaction?(a) CH3CHO(b) CH3CH2CHO(c) C6H5CHO(d) CH3COCH3
Answer» (d) CH₃COCH₃

Discussion

14.	Which of the following is not synthesized by Rosenmund reduction:(a) Formaldehyde(b) Acetaldehyde(c) Butyraldehyde(d) Formaldehyde and acetaldehyde
Answer» (a) Formaldehyde

Discussion

15.	What are the main reactions shows by carbonyl compounds?
Answer» Carbonyl compounds show the following types of chemical reactions: 1. Nucleophilic addition reactions 2. Nucleophilic addition-elimination reactions 3. Oxidation, reduction and halogenation. Among them, the nucleophilic addition reaction is the important reactions of carbonyl compounds. The main reactions of the carbonyl group are nucleophilic additions to the carbon‐oxygen double bond. As shown below, this addition consists of adding a nucleophile and a hydrogen across the carbon‐oxygen double bond. Due to differences in electronegativities, the carbonyl group is polarized.

15.

What are the main reactions shows by carbonyl compounds?

Answer»

Carbonyl compounds show the following types of chemical reactions:

1. Nucleophilic addition reactions

2. Nucleophilic addition-elimination reactions

3. Oxidation, reduction and halogenation.

Among them, the nucleophilic addition reaction is the important reactions of carbonyl compounds.

The main reactions of the carbonyl group are nucleophilic additions to the carbon‐oxygen double bond. As shown below, this addition consists of adding a nucleophile and a hydrogen across the carbon‐oxygen double bond. Due to differences in electronegativities, the carbonyl group is polarized.

Discussion

16.	Nitration of benzene gives nitrobenzene when HNO3 and H2SO4 take part in the reaction. Here HNO3 works as(a) as a base(b) as an acid(c) a reducing agent(d) as a catalyst
Answer» (a) as a base

Discussion

17.	Benzene diazonium chloride reacts with X gives dye, here reactant X is(a) C2H5OH(b) C6H6(c) C6H5NH2(d) H2O
Answer» The answer is (c) C₆H₅NH₂

Discussion

18.	The formula for chloropicrin is(a) C(NO2)Cl3(b) CCl(NO2)3(c) C(NO2)2Cl2(d) None of these
Answer» (a) C(NO₂)Cl₃

Discussion

19.	The hybridisation of N atom in alkyl amine is(a) sp2(b) sp3(c) sp(d) sp3d
Answer» The answer is (b) sp³

Discussion

20.	Identify X and Y in the following reactions:R R – CO NH2 \(\overset{Br_2/NaOH}{\longrightarrow}\) X \(\overset{CHCl_3/KOH}{\longrightarrow}\) Y
Answer» X = R – NH₂ (Alkylamine) Y = RNC N (Alkyl isocyanide)

Discussion

21.	C3H9N does not show(a) Primary amine(b) Quaternary salt(c) Tertiary amine(d) Secondary amine
Answer» (b) Quaternary salt

Discussion

22.	Alkylamines are strong base than ammonia. Explain.
Answer» Alkylamine is strongly basic than ammonia due to the electron releasing nature of the alkyl group. Basicity α +I effect Alkylamine having more + I effect than NH₃.

Discussion

23.	What is the reason that aromatic diazonium salt is more stable than aliphatic diazonium salt?
Answer» Aromatic diazonium salt is more stable than aliphatic diazonium salt due to the resonance stability of aromatic diazonium salt.

Discussion

Explore topic-wise InterviewSolutions in .

The major product of the reaction of methylamine with Tilden reagent is(a) CH3OH(b) CH3CHO(c) CH3Cl(d) CH3COOH

Write the general formula of alcohol.

Write the general formula of ether.

What is the effect of electron withdrawing groups on the acidity of phenol?

Write the order of acidity for primary, secondary and tertiary alcohols.

Write the IUPAC name of ethyl alcohol.

Write the IUPAC name of Isobutyraldehyde.

Write the IUPAC name of Acetaldehyde.

Which of the following method is used for conversion of the ketone to hydrocarbon?(a) Aldo condensation(b) Wolf-Kishner Reduction(c) Cannizzaro’s Reaction(d) Clemmenson Reduction

Aldehyde and ketones do not react with(a) Sodium bisulphide(b) Phenylhydrazine(c) Dihydrogen sodium phosphate(d) Semicarbazide

What is Tollen’s reagent?

Write the name of one aldehyde which does not give Fehling’s test.

Which of the following cannot be synthesised by Stephen’s reaction?(a) CH3CHO(b) CH3CH2CHO(c) C6H5CHO(d) CH3COCH3

Which of the following is not synthesized by Rosenmund reduction:(a) Formaldehyde(b) Acetaldehyde(c) Butyraldehyde(d) Formaldehyde and acetaldehyde

What are the main reactions shows by carbonyl compounds?

Nitration of benzene gives nitrobenzene when HNO3 and H2SO4 take part in the reaction. Here HNO3 works as(a) as a base(b) as an acid(c) a reducing agent(d) as a catalyst

Benzene diazonium chloride reacts with X gives dye, here reactant X is(a) C2H5OH(b) C6H6(c) C6H5NH2(d) H2O

The formula for chloropicrin is(a) C(NO2)Cl3(b) CCl(NO2)3(c) C(NO2)2Cl2(d) None of these

The hybridisation of N atom in alkyl amine is(a) sp2(b) sp3(c) sp(d) sp3d

Identify X and Y in the following reactions:R R – CO NH2 \(\overset{Br_2/NaOH}{\longrightarrow}\) X \(\overset{CHCl_3/KOH}{\longrightarrow}\) Y

C3H9N does not show(a) Primary amine(b) Quaternary salt(c) Tertiary amine(d) Secondary amine

Alkylamines are strong base than ammonia. Explain.

What is the reason that aromatic diazonium salt is more stable than aliphatic diazonium salt?