Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?

Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity

Open App

Class 12 Exam > Class 12 Questions > Directions: In the following questions, A st...

Join the Discussion on the App

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.

Reason (R): Acyl group sterically hinders the approach of further acyl groups.

a)
Both A and R are true and R is the correct explanation of A
b)
Both A and R are true but R is NOT the correct explanation of A
c)
A is true but R is false
d)
A is false and R is True

Correct answer is option 'C'. Can you explain this answer?

FREE This question is part of

Assertion & Reason Test: Amines

Attempt Test

Attempt this Test

Most Upvoted Answer

Directions: In the following questions, A statement of Assertion (A) ...

In alkylation, an amine can react with alkyl halide to form next higher class of amine caused by the presence of electron pair on nitrogen which makes amine to behave as nucleophile and alkyl halide thus undergo nucleophilic substitution reaction. When primary and secondary amines react with acid chlorides, anhydrides and esters to give monosubstituted amides as products. Acylation is carried out in the presence of a base stronger than the amine like pyridine which causes the shift of the equilibrium to the right side.

Free Test

FREE

Assertion & Reason Test: Amines
12 Ques | 24 Min

Start Free Test

View all free Class 12 tests

Community Answer

Directions: In the following questions, A statement of Assertion (A) ...

Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives a poly-substituted product.

Reason (R): Acyl group sterically hinders the approach of further acyl groups.

The correct answer is option 'C', i.e., A is true but R is false.

Explanation:
Acylation of Amines:
Acylation refers to the process of adding an acyl group (-CO-R) to a compound. When an amine is acylated, the acyl group replaces one of the hydrogen atoms in the amine molecule. The reaction is typically carried out using an acylating agent such as an acid chloride (acyl chloride) or an acid anhydride.

Alkylation of Amines:
Alkylation, on the other hand, involves the addition of an alkyl group (-R) to a compound. When an amine is alkylated, an alkyl group replaces one of the hydrogen atoms in the amine molecule. The reaction is usually carried out using an alkylating agent such as an alkyl halide.

Monosubstituted and Poly-substituted Products:
In the case of acylation of amines, only one acyl group can be added to the amine molecule. This is because the acyl group (-CO-R) is relatively large and sterically hinders the approach of further acyl groups. Therefore, the product obtained is monosubstituted, with only one acyl group replacing a hydrogen atom in the amine molecule.

In contrast, in the case of alkylation of amines, multiple alkyl groups can be added to the amine molecule. The alkyl groups (-R) are smaller in size compared to acyl groups and do not sterically hinder the approach of further alkyl groups. Therefore, the product obtained is poly-substituted, with multiple alkyl groups replacing hydrogen atoms in the amine molecule.

Explanation of the Reason:
The reason given in the statement (Reason R) is incorrect. It states that the acyl group sterically hinders the approach of further acyl groups, leading to the formation of a monosubstituted product. However, in reality, it is the large size of the acyl group that hinders the approach of further acyl groups, not its steric hindrance. Therefore, the reason provided is not a correct explanation for the given assertion.

Hence, the correct answer is option 'C', i.e., A is true but R is false.

Share via Whatsapp

View all answers Start learning for free

< Previous Question Next Question >

Explore Courses for Class 12 exam

Similar Class 12 Doubts

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly-substituted product.Reason : Acyl group sterically hinders the approach of further acyl groups

View answer

Directions: In the following questions, A statement of Assertion (

View answer

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. Assertion : Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene. Reason : Alkyl halides are less reactive than acyl halides.

View answer

Read the passage given below and answer the following questions:Reductive alkylation is the term applied to the process of introducing alkyl groups into ammonia or a primary or secondary amine by means of an aldehyde or ketone in the presence of a reducing agent. The present discussion is limited to those reductive alkylations in which the reducing agent is hydrogen and a catalyst or "nascent" hydrogen, usually from a metalacid combination; most of these reductive alkylations have been carried out with hydrogen and a catalyst. The principal variation excluded is that in which the reducing agent is formic acid or one of its derivatives; this modification is known as the Leuckart reaction. The process of reductive alkylation of ammonia consists in the addition of ammonia to a carbonyl compound and reduction of the addition compound or its dehydration product. The reaction usually is carried out in ethanol solution when the reduction is to be effected catalytically:Since the primary amine is formed in the presence of the aldehyde it may react in the same way as ammonia, yielding an additional compound, a Schiff's base (RCH= NCH2R) and finally, a secondary amine. Similarly, the primary amine may react with the imine, forming an addition product which also is reduced to a secondary amine Finally, the secondary amine may react with either the aldehyde or the imine to give products which are reduced to tertiary amines.Similar reactions may occur when the carbonyl compound employed is a ketone.Q. The reaction of ammonia and its derivatives with aldehydes is called

View answer

Read the passage given below and answer the following questions :The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their very high reactivity. Substitution tends to occur at ortho and para positions. If we have to prepare monosubstituted aniline derivative, how can the activating effect of –NH2 group be controlled? This can be done by protecting the –NH2 group by acetylation with acetic anhydride, then carrying out the desired substitution followed by hydrolysis of the substituted amide to the substituted amine.Q. What is the major product A of the following reaction

View answer

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?

Share with a Friend

Answer this doubt

Question Description
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?.

Solutions for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.

Here you can find the meaning of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.Reason (R): Acyl group sterically hinders the approach of further acyl groups.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 12 tests.

Explore Courses for Class 12 exam