CUET Preparation Today
Which of the following can be prepared from Sandmeyer's reaction? (A) Chlorobenzene Choose the correct answer from the options given below: |
(A), (B) and (D) only (A), (B) and (C) only (A), (B), (C) and (D) (A) and (B) only |
(A) and (B) only |
The correct answer is Option (4) → (A) and (B) only Sandmeyer reaction is used to replace the diazonium group (–N₂⁺) in an aromatic diazonium salt with chlorine, bromine, or cyanide using copper(I) salts. General reaction: Ar–N₂⁺X⁻ → (CuCl / CuBr) → Ar–Cl or Ar–Br + N₂ Thus, Sandmeyer reaction is commonly used to prepare:
Chlorobenzene Prepared by reacting benzene diazonium chloride with CuCl. C₆H₅N₂⁺Cl⁻ → CuCl → C₆H₅Cl + N₂ Bromobenzene Prepared by reacting benzene diazonium salt with CuBr. C₆H₅N₂⁺Cl⁻ → CuBr → C₆H₅Br + N₂ Iodobenzene Iodobenzene is formed by treating benzene diazonium salt with KI. This reaction does not require copper salts, so it is not a Sandmeyer reaction. Fluorobenzene Fluorobenzene is prepared by the Balz–Schiemann reaction, not by the Sandmeyer reaction. |
