Which of the following reaction does NOT involve replacement of diazonium group?

Which of the following reaction does NOT involve replacement of diazonium group?
  1. Reaction with potassium iodide
  2. Reaction with aniline
  3. Reaction with cuprous chloride in HCl
  4. Reaction with hypophosphorus acid

Asked in: MHT CET 2020 (14 Oct Shift 2)

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