ChemistryCBSE Class 12 · Sample paper, session 2025-26 · 1 mark · MCQ

CBSE Class 12 Chemistry sample paper 2025-26: question 12

From the official CBSE sample question paper for 2025-26, section A, question 12, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q12 · 1 mark · MCQHaloalkanes and Haloarenes

Identify the secondary benzylic halide and primary alkyl halide from the following:
(i) 2-chlorophenyl- $C H_{2} CH = C H_{2}$ (Cl on the ring ortho to allyl group)
(ii) $C_{6} H_{5} - C H_{2} - C H_{2} - C H_{2} - Cl$
(iii) $C_{6} H_{5} - C H_{2} - CH (Cl) - C H_{3}$
(iv) $C_{6} H_{5} - CH (Cl) - C H_{2} - C H_{3}$

(A)(i) and (iii)
(B)(iv) and (ii)
(C)(iii) and (iv)
(D)(i) and (ii)

Figure in the paper: Four benzene-ring structures: (i) ring with Cl and a $C H_{2} - CH = C H_{2}$ group on adjacent carbons; (ii) ring with $C H_{2} - C H_{2} - C H_{2} - Cl$ chain; (iii) ring with $C H_{2} - CH (Cl) - C H_{3}$ chain; (iv) ring with $CH (Cl) - C H_{2} - C H_{3}$ chain. See it in the official paper.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

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

Hint 1

A benzylic carbon is directly attached to the ring.

Hint 2

Count the carbons bonded to the C–Cl carbon.

Step-by-step solution

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(iv): Cl is on the carbon attached to the ring, and that carbon carries two carbon groups, so it is a secondary benzylic halide.
(ii): Cl is on a terminal $C H_{2}$ away from the ring, so it is a primary alkyl halide. The answer is (iv) and (ii).
1 mark

Answer: (iv) and (ii), option (B)

Where the marks are

Correct identification (1 mark)

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Chapter: Haloalkanes and Haloarenes (notes, formulas, where marks are lost and every past question)

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CBSE Class 12 Chemistry sample paper 2025-26: question 12

Hints

Step-by-step solution

Revise the chapter

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