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CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Class 12 MCQ


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21 Questions MCQ Test - CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives)

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CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 1

Only One Option Correct Type

Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q. 

What is formed as the major organic product in the reaction ?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 1

Primary amide is dehydrated on heating with P2O5 to give nitrile.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 2

What is formed as the major organic product of the reaction?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 2


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CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 3

Which is most reactive in base catalysed hydrolysis reaction?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 3

Electron withdrawing group increases the electrophilicity of amide, hence increases reactivity in base (HO-) catalysed hydrolysis.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 4

Which reaction given below produces a secondary amide? 

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 4

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 5

Which reaction gives a polymeric amide?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 5

Reaction occur at both ends of ester.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 6

Which reaction gjyen below gives a lactum as the major organic product?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 6


Since, —COOH and —NH2 are on same side in (I), they condenses to give lactum.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 7

What is the major product of the reaction?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 7

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 8

Which of the following reactions does not give ethanamide?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 8

*Multiple options can be correct
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 9

One or More than One Options Correct Type

Direction (Q. Nos. 9-14) This section contains 6 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. 

Which reagent given below can bring about the following transformation?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 9

All the given compounds react with amine to form stable acid derivative amide.

*Multiple options can be correct
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 10

Which is/are the expected product in the following sequence of reaction?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 10

*Multiple options can be correct
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 11

Consider the following Hofmann’s degradation reaction,

Q. 

The expected product(s) is/are

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 11

No cross-over products are form ed because the rate determining step is a concerted rearrangement.

*Multiple options can be correct
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 12

Which reaction(s) below gives primary amine?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 12

(a) Hofmann’s degradation of primary amide gives primary amine.
(b) Carboxylic acid on heating with hydrazoic acid gives primary amine.
(c) Primary amide on reduction with LiAIH4 gives primary amine.
(d) NaBH4 does not reduce primary amides.

*Multiple options can be correct
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 13

In the reaction given below, the intermediates formed is/are

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 13

In Hofmann's bromamide degradation, N-bromamide is formed in the first step and isocyanate is formed in the slow rate determining step. Nitrine and hydroxamic acids are not formed.

*Multiple options can be correct
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 14

Consider the following hydrolysis reaction of a pure enantiomer of amide,

Q. 

The correct statement regarding the above hydrolysis reaction is/are

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 14

Amides can be hydrolysed in both acidic m edium. During hydrolysis of amides, alkylnitrogen bond is not dissociated, hence configuration at a-carbon of amine is retained.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 15

Comprehension Type

Direction (Q. Nos. 15-17) This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

Hofmann’s bromamide degradation is used to convert a primary amide into primary amine. The proposed mechanism of reaction are :







Q. 

Which is the most important intermediate formed in the slow, rate determining step?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 15

Isocyanate is the most important intermediate formed in the slow rate determining step.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 16

Hofmann’s bromamide degradation is used to convert a primary amide into primary amine. The proposed mechanism of reaction are :







Q. 

In the following reaction,

Formation of the above shown products and not any cross-products eliminates completely which step of the reaction mechanism?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 16

Had the reaction occurred via step (V), carbanion could have attacked either of bromocyanates giving cross-over products also.

CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 17

Hofmann’s bromamide degradation is used to convert a primary amide into primary amine. The proposed mechanism of reaction are :







Q. 

 If a pure enantiomer of amide given below is used

What can be predicted regarding product?

Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 17

Since, carbanion is not set free, configuration at α-carbon of amide is retained in amine

*Answer can only contain numeric values
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 18

One Integer Value Correct Type

Direction (Q. Nos. 18-21) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

Q. 

 How many amide isomers exist for C4H9ON that do not form amine on treatment with Br2-NaOH ?


Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 18

Secondary and tertiary amides do not undergo Hofmann’s degradation.


*Answer can only contain numeric values
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 19

How many amide isomers exist for C5H11ON that on treatment with NaOH/Br2 give amines ?


Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 19

Primary amides react with NaOH, Br2 to give primary amines.

*Answer can only contain numeric values
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 20

Nylon-6 is formed by the acid catalysed hydrolysis of a cyclic amide. How many carbon atoms are present in this cyclic amide ?


Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 20

*Answer can only contain numeric values
CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 21

How many total amide isomers exist for C3H7ON?


Detailed Solution for CPU 6 - Acid Amides (Carboxylic Acids And Acid Derivatives) - Question 21

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