If a synthetic organic chemist explicitly intends to prepare chlorobenzene from an existing benzened — Haloalkanes and Haloarenes Chemistry Question

💡 Solution & Explanation

The Gattermann reaction is fundamentally defined by the use of finely divided elemental copper powder mixed with the appropriate halogen acid. To synthesize chlorobenzene, copper powder and concentrated $HCl$ are added to the diazonium salt. Using cuprous chloride ($Cu_2Cl_2$) would classify the procedure as a Sandmeyer reaction.