What is the value of $\mathrm{C}-0$ -H bond angle in $\mathrm{CH}_{3}-\mathrm{OH}$ ?

• Correct answer
  A

  $108.9^{\circ}$
• B

  $107^{\circ}$
• C

  $109.5^{\circ}$
• D

  $110^{\circ}$

Solution

$108.9^{\circ}$ Due to repulsion between lone pair electrons of oxygen atoms, the $\mathrm{C}-\mathrm{O}-\mathrm{H}$ bond angle in $\mathrm{CH}_{3}-\mathrm{OH}$ (methanol) is $108.9^{\circ}$. It can be readily demonstrated as follows:

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