Question

Why does `HBr` have a higher boiling point than `HCl`?

Answer 1

As a physical scientist, you really should quote these boiling points, these physical data.

Explanation:

`HBr` is a larger, more polarizable molecule than `HCl`. There should be a greater degree of dispersion forces, forces between molecules, operating in the `HBr` molecule, and thus the higher boiling point is observed.

Hang on, the boiling point of `HF=19.5 ""^@C`, higher than those of `HCl` and `HBr`. Doesn't this blow my proposal out of the water?