The sequence of reagents required to convert aniline to benzene nitrile are

• A

  $\mathrm{NaNO}_2+\mathrm{HCl}, 293-298 \mathrm{~K}$; $\mathrm{CuCN} / \mathrm{KCN}$
• Correct answer
  B

  $\mathrm{NaNO}_2+\mathrm{HCl}, 273-278 \mathrm{~K}$; $\mathrm{CuCN} / \mathrm{KCN}$
• C

  $\mathrm{NaNO}_2+\mathrm{HCl}, 273-298 \mathrm{~K}$; $\mathrm{Cu} / \mathrm{HCN}$
• D

  $\mathrm{Cl}_2 / \mathrm{Fe}$; $\mathrm{KCN}$

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