Identify the product ' B ' obtained in following reaction. $\mathrm{R}-\mathrm{C} \equiv \mathrm{~N} \xrightarrow{\mathrm{SnCl}_2} \mathrm{ACl} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B}$

• A

  $\mathrm{R}-\mathrm{NH}_2$
• B

  $\mathrm{R}-\mathrm{CONH}_2$
• Correct answer
  C

  $\mathrm{R}-\mathrm{CHO}$
• D

  $\mathrm{R}-\mathrm{COOH}$

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