Question

The variation of the boiling points of the hydrogen halides is in the order $HF>HI>HBr>HCl$. What explains the higher boiling point of hydrogen fluoride?

• A. The bond energy of $HF$ molecules is greater than in other hydrogen halides
• B. The effect of nuclear shielding is much reduced in fluorine which polarises the $HF$ molecule
• C. The electronegativity of fluorine is much higher than for other elements in the group.
• D. There is strong hydrogen bonding between $HF$ molecules

Answer 1

The correct option is D There is strong hydrogen bonding between $HF$ molecules

Due to strong $H$-bonding in $HF$ molecule, boiling point is highest for $HF$.
$HF>HI>HBr>HCl$