Organic Chemistry Questions and Answers – Amides

This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Amides”.

1. When acetamide is treated with HNO2, the gas is evolved which of the following?
a) H2
b) O2
c) N2
d) CH4
View Answer

Answer: c
Explanation: When acetamide is treated with HNO2, the gas is evolved in nitrogen gas.
CH3 – CO – NH2 + HNO2 → CH3COOH + N2↑ + H2O
      Acetamide                       Acetic acid

2. On heating acetamide in presence of P2O5, which of the following is formed?
a) Ammonium acetate
b) Acetonitrile
c) NH3
d) Methylamines
View Answer

Answer: b
Explanation: On heating acetamide in presence of P2O5, acetonitrile is formed.
On heating acetamide in presence of P2O5, acetonitrile is formed

3. Decreasing order of basicity of the given compound is which of the following?

(1) CH3CONH2 
(2) CH3CH2NH2
(3) PhCH2CONH2
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a) 1 > 2 > 3
b) 2 > 1 > 3
c) 3 > 2 > 1
d) 1 > 3 > 2
View Answer

Answer: b
Explanation: Comparing the basicity of alkyl amines to amides. With an alkyl amine the lone pair electron is localized on the nitrogen. However, the lone pair electron on an amide are delocalized between the nitrogen and the oxygen through resonance. This makes amides much less basic compared to alkyl amines. And more the stabilization in amide less will be basic, here PhCH2CONH2 will be stabilizes by resonance.

4. By refluxing unsubstituted amide with acid, it will yield which of the following product(s)?
a) ammonia
b) carboxylic acid
c) nitrogen gas
d) ammonia and carboxylic acid
View Answer

Answer: d
Explanation: By refluxing unsubstituted amide with acid, it will yield and ammonia and carboxylic acid.
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5. Which one of the following reducing agents is likely to be the most effective in bringing about the following change?
R−CONH2 → RCH2NH2
a) H2−Ni
b) NaBH4
c) LiAlH4
d) Na-alcohol
View Answer

Answer: a
Explanation: H2−Ni reducing agents is likely to be the most effective in conversion of amide to amine.
Find reducing agents likely to be most effective in bringing about the following change

6. Ethyl amine on acetylation gives which of the following?
a) N-ethyl acetamide
b) Acetamide
c) Methyl acetamide
d) N,N-dimethyl acetamide
View Answer

Answer: a
Explanation: Ethyl amine on acetylation gives N-ethyl acetamide, as shown in given reaction.
CH3CH2NH2 + CH3COCl → CH3CH2NHCOCH3 + HCl
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7. Benzamide on reaction with POCl3 gives which of the following?
a) Aniline
b) Chlorobenzene
c) Benzyl amine
d) Benzonitrile
View Answer

Answer: d
Explanation: POCl3 is a dehydrating agent so Benzamide on reaction with POCl3 gives benzonitrile.
POCl3 is a dehydrating agent so Benzamide on reaction with POCl3 gives benzonitrile

8. Amides may be converted into amines by reaction named after which of the following reaction?
a) Perkin
b) Claisen
c) Hoffmann
d) Kolbe
View Answer

Answer: c
Explanation: Amides may be converted into amines by reaction named after Hoffmann bromamide reaction.
Amides may be converted into amines by reaction named after Hoffmann bromamide reaction
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9. What will be the product for the given reaction?
The product for the given reaction is CH3COBr
a) CH3Br
b) CH4
c) CH3COBr
d) CH3NH2
View Answer

Answer: c
Explanation: Amide on reacting with NaOBr will give an amine as shown below.
Amide on reacting with NaOBr will give an amine as shown

10. Ethylamine can be prepared by the action of bromine and caustic potash on which of the following?
a) Acetamide
b) Propionamide
c) Formamide
d) Methyl cyanide
View Answer

Answer: b
Explanation: Ethylamine can be prepared by the action of bromine and caustic potash on propionamide.
CH3 – CH2 – CO – NH2 + Br2 + 4KOH → CH3CH2NH2 + K2CO3 + 2KBr + 2H2O
      propionamide

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