Why does hydrogen chloride have a lower normal boiling point than hydrogen fluoride or hydrogen bromide?

Question

Why is the normal boiling point of hydrogen chloride lower than those of hydrogen fluoride and hydrogen bromide?

Answer 1

HF has hydrogen bonding which produces more intermolecular attraction and a higher boiling point than HCl

HBr has stronger London dispersion forces than HCl because Br has more electrons which are spread out over a greater volume which means that HBr is more polarizable than is HCl. LDF's are directly proportional to the ploarizability of a moleclue.