Skip to content

When (–)-2-bromohexan… (Class 12 Chemistry SQP 2026-27, Q10)

questionbuddy.in/q/cbse-12-chemistry-2026-27-sqp-q10-bromohexane-reacts-sodium-hydroxide-hexan

ChemistryCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2026-27: question 10

From the official CBSE sample question paper for 2026-27, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQHaloalkanes and Haloarenes

When (–)-2-bromohexane reacts with sodium hydroxide, (+)-hexan-2-ol is formed. Which one of the following observation would be correct?

  1. (A)The reaction follows mechanism and is accompanied by inversion of configuration.
  2. (B)The reaction follows mechanism and is accompanied by inversion of configuration.
  3. (C)The reaction follows mechanism and is accompanied by retention of configuration.
  4. (D)The reaction follows mechanism and is accompanied by retention of configuration.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Ask whether the product is racemic or a single optical isomer.

Hint 2

Recall which mechanism involves backside attack.

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. 2-Bromohexane is a secondary halide. Its reaction with OH⁻ here gives a single optically active product.

  2. Formation of only one enantiomer, with no racemisation, shows backside attack by OH⁻. This is the mechanism, which gives inversion of configuration. So the answer is A.

    1 mark

Answer: Option (A)

Where the marks are

  • Identifies with inversion of configuration (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 paperSample paper 2026-27: 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.