Predict respectively ' $X$ ' and ' $Y$ ' in the following reactions. $\mathrm{Ar}-\mathrm{NH}_2 \stackrel{x}{\longrightarrow} \mathrm{Ar}-\stackrel{+}{\mathrm{N}} \equiv \mathrm{NCl}^{-} \stackrel{y}{\longrightarrow} \mathrm{Ar}-\mathrm{Cl}$

• A

  $\mathrm{NaNO}_3$ and $\mathrm{Cl}_2$
• B

  $\mathrm{NaNO}_3-\mathrm{HCl}$ and $\mathrm{HCl}$
• Correct answer
  C

  $\mathrm{NaNO}_2-\mathrm{HCl}$ and $\mathrm{Cu} / \mathrm{HCl}$
• D

  $\mathrm{NaNO}_2-\mathrm{HCl}$ and $\mathrm{NaNH}_2$

Solution

The sequence of reaction is

Hence, the correct answer is option: 'C'.