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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si159

Benzenediazonium chloride is treated with different reagents. Select the correct product(s).

A $H X_{3} PO X_{2} / H X_{2} O$ gives benzene
B $CuCN$ gives phenylacetonitrile
C $CuBr / HBr$ gives bromobenzene
D $KI$ gives iodobenzene

Answer: A, C, D

The Sandmeyer reaction with

CuBr

gives bromobenzene. Hypophosphorous acid reduces the diazonium group to H, giving benzene.

KI

gives iodobenzene.

CuCN

gives benzonitrile,

C X_{6} H X_{5} CN

, with no extra carbon, so phenylacetonitrile is wrong.

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