MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Sandmeyer's reaction is a chemical reaction used to synthesize aryl halides from aryl diazonium salts. It involves the replacement of the diazonium group (- N _2^+) in Ar-N _2^+ X ^- by a halogen atom (such as Cl or Br) or a cyanide group using copper(I) salts like CuCl / HCl , CuBr / HBr , or CuCN / KCN . The reaction to obtain R-I from R-Cl is known as the Finkelstein reaction. The reaction to obtain R-F from R-Cl using AgF is known as the Swarts reaction. The reaction to obtain R-CH _2 -R from R-CO-R using Zn-Hg / HCl is known as the Clemmensen reduction. Therefore, Sandmeyer's reaction is used to obtain Ar-X by replacing the diazo group of Ar-N _2^+ X ^- using CuCl / HCl . Answer: To obtain Ar-X by replacing diazo group of AR-N _2^+ -X ^- using CuCl / HCl