The order of the boiling points is; HF > HCl > HBr > HI
How does molecular mass affect intermolecular forces in compounds?
The intensity of intermolecular forces typically increases with molecular mass. Greater dispersion forces can be experienced by larger molecules since they contain more electrons.
Moreover, polar molecules with larger molecular masses might interact with other molecules more strongly, and molecules that can form hydrogen bonds might do so with greater bonding as their molecular mass increases.