Question

Benzene diazonium chloride on hydrolysis gives:

• A. Benzene
• B. Benzyl alcohol
• C. Phenol
• D. Chlorobenzene

Answer 1

Answer: (C)

Phenol

First we write the reaction to generate benzenediazonium chloride
$C_6{H}_{5}N{H}_2+NaN{O}_2+HCl(0-5^{\circ }C)\to Ph{N}_2^{+}C{l}^{-}$

Now, when benzene diazonium chloride is hydrolysed, the nitrogen $N_2$ escapes leaving the water molecule to attack.
$Ph{N}_2^{+}C{l}^{-}+H_{2}O\to PhOH\left(phenol\right)+N_2+HCl$

So, C is the correct answer.