The reaction of benzene with chlorine in the presence of $Fe$ produces.........

In Gattermann reaction,a diazonium group is replaced by $\underline{X}$ using $\underline{Y}$. $\underline{X}$ and $\underline{Y}$ are:
$\underline{X} \quad \underline{Y}$

Chlorobenzene is obtained from its corresponding diazonium salt by reaction with ......

High yield of aryl halide is formed in

Industrially,chlorobenzene is prepared by:

Which of the following pairs of aryl halides can $\underline{NOT}$ be prepared directly by electrophilic substitution?