Benzene diazonium chloride on hydrolysis gives:

Benzene

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Benzyl alcohol

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Phenol

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Chlorobenzene

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Solution

The correct option is B Phenol
First we write the reaction to generate benzenediazonium chloride
$C_{6} H_{5} N H_{2} + N a N O_{2} + H C l (0 - 5^{\circ} C) \to P h N_{2}^{+} C l^{-}$

Now, when benzene diazonium chloride is hydrolysed, the nitrogen $N_{2}$ escapes leaving the water molecule to attack.
$P h N_{2}^{+} C l^{-} + H_{2} O \to P h O H (p h e n o l) + N_{2} + H C l$

So, C is the correct answer.

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