Question

A polar bond is formed between two atoms of different electronegativity. A polar molecule results when there is only one polar bond, or more than one polar bond within it is not sufficiently symmetrically oriented to cancel the effects of the others.

Select the correct order of boiling point.

• A. $H_{2}O<HF$
• B. $H_{2}O>HF$
• C. $HF=H_{2}O$
• D. None of these

Answer 1

The correct option is B $H_{2}O>HF$

The presence of $OH$ group makes the extent of hydrogen bonding in water much stronger than that in $HF$. This gives it a higher boling point.