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Given below are two… (Class 12 Chemistry SQP 2023-24, Q13)

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ChemistryCBSE Class 12 · Sample paper, session 2023-24 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry sample paper 2023-24: question 13

From the official CBSE sample question paper for 2023-24, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedAlcohols, Phenols and Ethers

Given below are two statements labelled as Assertion (A) and Reason (R)
Assertion (A): Alcohols react both as nucleophiles and electrophiles.
Reason (R): The bond between C–O is broken when alcohols react as nucleophiles.
Select the most appropriate answer from the options given below:

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

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

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

Hint 1

Which bond breaks when the oxygen attacks an electrophile?

Hint 2

The C–O bond breaks when alcohols act as electrophiles.

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: alcohols act as nucleophiles (O–H bond breaks) and as electrophiles (C–O bond breaks, after protonation).

  2. As nucleophiles, it is the O–H bond that breaks, not C–O, so R is false.

    1 mark

Answer: (C)

Where the marks are

  • Recognises A true and R false (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Alcohols, Phenols and Ethers, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2023-24: 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.