What is the name of the following reaction?
$ArN_2^+X^- + Cu_2Cl_2 + HCl \rightarrow \text{Chlorobenzene} + N_2$

Which of the following are intermediates in the Sandmeyer reaction?
$(i)$ $C_6H_5N^{+} \equiv NCl^{-}$
$(ii)$ $C_6H_5N^{+} \equiv N$
$(iii)$ $\overset{\centerdot }{C}_6H_5$
$(iv)$ $C_6H_5Cl$

Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?

The conversion of benzene diazonium chloride to chlorobenzene in the presence of $CuCl / HCl$ is known as:

Aryl fluoride may be prepared from arene diazonium chloride using

Write the structures and names of the compounds formed when compound $A$ with molecular formula $C_7H_8$ is treated with $Cl_2$ in the presence of $FeCl_3$.