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Assertion (A) : Acetylation… (Class 12 Chemistry 2023, Q16)

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ChemistryCBSE Class 12 · Board exam 2023, set 56/1/1 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry 2023: question 16

Set in the CBSE Class 12 board exam of 2023, paper 56/1/1, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · Assertion-reasonCompetency-basedAmines

Assertion (A) : Acetylation of aniline gives a monosubstituted product.
Reason (R) : Activating effect of group is more than that of amino group.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 56/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Why is aniline acetylated before nitration or bromination?

Hint 2

The acetyl group pulls the N lone pair towards C=O.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. A is true: acetylation controls the activity of the ring, so a monosubstituted product is obtained.

  2. R is false: the lone pair on N in is also delocalised onto the C=O group, so its activating effect is less than that of . Option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • A true, R false (1 mark)

Revise the chapter

  • Chapter: Amines (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Amines, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 56/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.