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NEET levelSingle correct optionDifficulty 1 of 3nc058

Benzenediazonium chloride is converted into iodobenzene simply by treatment with

A $KI$ (no copper catalyst is needed)
B $NaCl$ and Cu powder
C $HBF X_{4}$ followed by heating
D $CuCN / KCN$

Answer: A

Iodide is a good enough nucleophile to displace

N X_{2}

from the diazonium ion directly, so

KI

alone gives

C X_{6} H X_{5} I

. Chlorination needs

CuCl

(Sandmeyer) or Cu powder (Gattermann),

HBF X_{4}

then heat gives fluorobenzene, and

CuCN / KCN

gives benzonitrile.

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