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JEE Main levelSingle correct optionDifficulty 2 of 3nc062

Which of the following conversions of benzenediazonium chloride does NOT occur as stated?

ACu powder and $HBr$ give bromobenzene
Btreatment with aqueous $KCl$ alone gives chlorobenzene
C $CuCN / KCN$ gives benzonitrile
D $H X_{3} PO X_{2}$ gives benzene

Answer: B

Chlorination of a diazonium ion needs copper:

CuCl / HCl

(Sandmeyer) or Cu powder with

HCl

(Gattermann). Chloride ion without copper does not displace

N X_{2}

in the cold, unlike iodide. The other three statements are correct.

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