(D) The conversion of benzene diazonium chloride $(C_6H_5N_2Cl)$ to bromobenzene $(C_6H_5Br)$ is achieved by treating it with hydrogen bromide $(HBr)$

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(D) The conversion of benzene diazonium chloride $(C_6H_5N_2Cl)$ to bromobenzene $(C_6H_5Br)$ is achieved by treating it with hydrogen bromide $(HBr)$ in the presence of copper powder. This reaction is known as the Gattermann reaction. The reaction is: $C_6H_5N_2Cl + HBr \xrightarrow{Cu} C_6H_5Br + N_2 + HCl$.