Answer:
F is small and very electronegative atom. The H–F bond is therefore highly polarised and strong H-bonds form in this liquid. These are much stronger than dispersion forces and so HF has an anomalously high boiling point. ... HI has higher boiling point than HCl and HBr.
We can conclude, the order of boiling point followed is HF > HI > HBr > HCl. ... The reason is the presence of strong hydrogen bonding in the HF, as hydrogen intermolecular interactions are greater than the van der Waals forces. So, HF has a higher boiling point than the HI
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