The
bond angle in A is X and
bond angle in B in Y . What are X and Y ?
$\begin{array}{|c|c|}\hline \mathrm{H}_3 \mathrm{C} -\mathrm{OH} & \mathrm{H}_3 \mathrm{C} -\mathrm{O \mathrm{CH}_3} \\\hline A & B \\\hline\end{array}$

• Correct answer
  A

  $\mathrm{X}\gt109^{\circ} 28^{\prime}, \mathrm{Y}\gt109^{\circ} 28^{\prime}$
• B

  $\mathrm{X} \lt 109^{\circ} 28^{\prime}, \mathrm{Y} \lt 109^{\circ} 28^{\prime}$
• C

  $\mathrm{X} \lt 109^{\circ} 28^{\prime}, \mathrm{Y}\gt109^{\circ} 28^{\prime}$
• D

  $\mathrm{X}\gt109^{\circ} 28^{\prime}, \mathrm{Y} \lt 109^{\circ} 28^{\prime}$

Solution

As the steric crowding increases bond angle increases due to repulsion between the bulky atom.

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