In the reaction sequence, $\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}+\mathrm{KCN} \stackrel{\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}}{\longrightarrow} X \underset{\Delta}{\stackrel{\mathrm{H}_3 \mathrm{O}^{\oplus}}{\longrightarrow}}$$Y$ What is the molecular formula of $Y$ ?

• Correct answer
  A

  $\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}_2$
• B

  $\mathrm{C}_3 \mathrm{H}_5 \mathrm{~N}$
• C

  $\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2$
• D

  $\mathrm{C}_2 \mathrm{H}_6 \mathrm{O}$

Solution

$\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}+\mathrm{KCN} \stackrel{\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}}{\longrightarrow} \mathrm{C}_2 \mathrm{H}_5 \mathrm{CN} (X)+\mathrm{KCl}$
So, the molecular formula of the $Y$ is $\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}_2$.

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