AIIMS 2018 Chemistry Diazonium Salts MCQ Question

The reaction of benzenediazonium chloride with cuprous chloride (CuCl) in hydrochloric acid (HCl) to form chlorobenzene is known as the Sandmeyer reaction. This reaction is a method for synthesizing aryl halides from diazonium salts, where the diazonium group is replaced by a halogen atom. The Gattermann reaction involves the introduction of formyl groups into aromatic compounds, the Perkin reaction is a method for synthesizing unsaturated aromatic acids, and the Etard reaction is used for the oxidation of toluene to form benzaldehyde, making them irrelevant to the formation of chlorobenzene from benzenediazonium chloride.