Question

The comparatively high b.pt of $HF$ is due to:

• A. high reactivity of fluoring
• B. small size of hydrogen atom
• C. formation of hydrogen bonds and consequent association
• D. high IE of flourine

Answer 1

The correct option is C formation of hydrogen bonds and consequent association

Intermolecular hydrogen bonding is found in ${\left(HF\right)}_n$ due to higher electronegativity of fluorine atoms

$\underset{\downarrow hydrogenbonding}{\cdot \cdot \cdot H-F\cdot \cdot \cdot H-F\cdot \cdot \cdot H-F\cdot \cdot \cdot }$

Hydrogen bonding is helpful in the association of $HF$ molecule, so $HF$ is found in liquid form.