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Which of the following is… (Class 12 Chemistry 2026, Q9)

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ChemistryCBSE Class 12 · Board exam 2026, set 56/1/1 · 1 mark · MCQ

CBSE Class 12 Chemistry 2026: question 9

Set in the CBSE Class 12 board exam of 2026, paper 56/1/1, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · MCQHaloalkanes and Haloarenes

Which of the following is 'not' true about enantiomers ?

  1. (A)They have the same chemical reactivity.
  2. (B)They have the same specific rotation.
  3. (C)They have the same melting or boiling point.
  4. (D)They have the same refractive index.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 56/1/1.

Hints

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

Hint 1

Enantiomers are non-superimposable mirror images.

Hint 2

Consider the direction of optical rotation.

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. Enantiomers have identical physical properties, such as melting point and refractive index, and the same chemical reactivity.

  2. They rotate plane-polarised light by equal amounts but in opposite directions, so their specific rotations are opposite in sign. Statement (B) is not true.

    1 mark

Answer: Option (B)

Where the marks are

  • Recognises that specific rotations are opposite in sign (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 paper2026 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.