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JEE Main2026Jan 28, Shift 2Chemistry
Q.

Which of the following reaction is NOT correctly represented ?

  1. A

    1

  2. B

    2

  3. C

    3

  4. D

    4

Solution

Allylic bromination by Br/hv proceeds through the most stable allylic radical. In 3-methylcyclohex-1-ene the allylic carbon adjacent to the methyl is a centre (more stable radical) than the methyl group itself ().

The major product is the ring-allylic bromide (3-bromo-3-methylcyclohex-1-ene) and not the methyl-substituted side-chain bromide shown in option (1). Option (1) is therefore the incorrect representation.

Options (2)-(4) depict standard Sandmeyer-type bromination, photolytic side-chain bromination of toluene, and Lewis-acid-catalysed ring bromination of toluene respectively — all correctly drawn.

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