Chapter 11 - Section 11.3 - Intermolecular Forces: The Forces that Hold Condensed Phases Together - For Practice - Page 497: 11.2

The boiling point of $ HF$ is higher than $ HCl$ due to hydrogen bonding in $HF$.

$ HF$ is able to form hydrogen bonds because $H$ is bonded to a strongly electronegative element, $F$. The hydrogen bond is the strongest intermolecular force and requires a lot of energy to break. So, the boiling point of $ HF$ is higher than $ HCl$.