Industrially,chlorobenzene is prepared by:

Discuss the role of Lewis acids in the preparation of aryl bromides and chlorides in the dark.

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

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

How can fluorobenzene be prepared in the laboratory?

Aryl fluoride may be prepared from arene diazonium chloride using