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NEET levelSingle correct optionDifficulty 1 of 3nc130

Benzenediazonium chloride is converted into chlorobenzene by

A $NaCl$ solution
B $H X_{3} PO X_{2}$
C $KCN$ / $CuCN$
D $CuCl$ / $HCl$ (Sandmeyer reaction)

Answer: D

The Sandmeyer reaction uses cuprous chloride in HCl to replace the diazonium group by chlorine. Plain chloride ion does not displace the diazonium group,

H X_{3} PO X_{2}

replaces it by hydrogen and CuCN/KCN gives the nitrile.

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