Identify reagent ' $A$ ' used in the following reaction?

Identify reagent ' $A$ ' used in the following reaction?
  1. $\xrightarrow[\Delta]{\text { dil. } / \mathrm{HCl}}$
  2. $\xrightarrow[\text { low temp. }]{\mathrm{NaNO}_2+\mathrm{HCl}}$
  3. $\xrightarrow[\Delta]{\mathrm{H}_3 \mathrm{O}^{+}}$
  4. $\mathrm{NaOH}, 623 \mathrm{~K}$

Solution

This is the diazotisation reaction of aniline.

Asked in: MHT CET 2024 (15 May Shift 2)

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