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NEET levelSingle correct optionDifficulty 1 of 3nc057

Which reagent converts benzenediazonium chloride into benzene?

A $CuCl / HCl$
B $H X_{3} PO X_{2}$ (hypophosphorous acid) and $H X_{2} O$
C $KI$
D $CuCN / KCN$

Answer: B

Hypophosphorous acid (or ethanol) replaces the diazonium group by hydrogen (deamination), giving

C X_{6} H X_{6}

and

N X_{2}

.

CuCl / HCl

gives chlorobenzene,

KI

gives iodobenzene and

CuCN / KCN

gives benzonitrile.

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