Aryl fluoride may be prepared from arene diazonium chloride using :

Aryl fluoride may be prepared from arene diazonium chloride using :
  1. $\mathrm{HBF}_4 / \Delta$
  2. $\mathrm{HBF}_4 / \mathrm{NaNO}_2, \mathrm{Cu}, \Delta$
  3. $\mathrm{CuF} / \mathrm{HF}$
  4. $\mathrm{Cu} / \mathrm{HF}$

Asked in: MHT CET Full Test 11

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