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Practical Organic Chemistry: Sandmeyer reactions MCQ

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Sandmeyer reactionsEasyQuestion 910002

Question

To convert aniline to iodobenzene via diazotisation, the reagent used is:
  1. A
    KI (no Cu catalyst needed)
    Correct
  2. B
    CuI
  3. C
    HI directly on aniline
  4. D
    I₂/KI

Correct answer

KI (no Cu catalyst needed)

Explanation

Conversion to ArI: ArN₂⁺ + KI → ArI + N₂ + KCl. Unlike Cl and Br (which need CuX catalyst — Sandmeyer), iodide substitution occurs directly with KI (simple heating). Also CuCN for ArCN, HBF₄ for ArF (Balz-Schiemann).

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