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Assertion (A) : Inversion… (Class 12 Chemistry 2024, Q15)

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ChemistryCBSE Class 12 · Board exam 2024, set 56/5/1 · 1 mark · Assertion-reason

CBSE Class 12 Chemistry 2024: question 15

Set in the CBSE Class 12 board exam of 2024, paper 56/5/1, section A, question 15, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q15 · 1 mark · Assertion-reasonCompetency-basedHaloalkanes and Haloarenes

Assertion (A) : Inversion of configuration is observed in reaction.
Reason (R) : The reaction proceeds with the formation of carbocation.

  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 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 2024 board paper, set 56/5/1.

Hints

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

Hint 1

Is a one-step or a two-step reaction?

Hint 2

Which mechanism goes through a carbocation?

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. is a one-step reaction with backside attack through a transition state, so inversion of configuration occurs. Assertion is true.

  2. Carbocations form in , not , so the Reason is false. Option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Assertion true, Reason false (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Haloalkanes and Haloarenes, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 56/5/1: 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.