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

Aryl fluoride may be prepared from arene diazonium chloride using

Explain the preparation of aryl halides from aromatic hydrocarbons.

Industrially,chlorobenzene is prepared by:

Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains

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