Which molecule among the following exhibits hydrogen bonding?

Solution

1. Hydrogen bonding requires hydrogen to be attached to a highly electronegative atom such as $\text{F}$, $\text{O}$, or $\text{N}$.
2. In $\text{HF}$, hydrogen is bonded to fluorine, which is the most electronegative element.
3. This creates a strong dipole that allows for intermolecular hydrogen bonding.
4. Hence the answer is (C).