MHT CET202613 April 2026Evening ShiftChemistryHaloalkanes and HaloarenesActual
What is the importance of Sandmeyer's reaction?
Options
- ATo obtain R-I from R-Cl
- BTo obtain Ar-X by replacing diazo group of AR-N ₂^+ -X ^- using CuCl / HCl
- CTo obtain R-F from R-Cl using AgF
- DTo obtain R-CH ₂ -R from R-CO-R using Zn-Hg / HCl
Correct answer
B. To obtain Ar-X by replacing diazo group of AR-N ₂^+ -X ^- using CuCl / HCl
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