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QUESTION

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

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

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?