Question 61: Identify the product in the following reaction:
A benzene diazonium chloride is treated successively with (i) \mathrm{Cu_2Br_2/HBr}, (ii) \mathrm{Mg/dry\ ether} and (iii) \mathrm{H_2O}.
Answer: Option (4)
Explanation:
In the first step, benzene diazonium chloride reacts with \mathrm{Cu_2Br_2/HBr} to form bromobenzene by the Sandmeyer reaction.
In the second step, bromobenzene reacts with magnesium in dry ether to form phenyl magnesium bromide, which is a Grignard reagent.
In the final step, phenyl magnesium bromide undergoes hydrolysis with
\mathrm{H_2O} to give benzene.
Therefore, the final product of the reaction sequence is benzene.