The comparatively high b.pt. of $\mathrm{HF}$ is due to

• A

  high reactivity of fluorine
• B

  small size of hydrogen atom
• Correct answer
  C

  formation of hydrogen bonds and consequent association
• D

  high IE of fluorine

Solution

Intermolecular hydrogen bonding is found in (HF) $_{n}$ due to higher electronegativity of fluorine atoms.
Hydrogen bonding is helpful in the association of HF molecule, so $\mathrm{HF}$ is found in liquid form.

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