why is thr boiling point of water less than hydrogen fluoride.

Dear Student,

The boiling point of hydrogen fluoride is greater than than of hydrogen chloride
The boiling point of water is greater than that of hydrogen sulfide
The boiling point of ammonia is greater than that of phosphine
The boiling point of methane is less than that of silane

The boiling points of hydrogen fluoride, water and ammonia do not follow the trend lines.
This means that there must be stronger intermolecular force in these compounds.
We call these forces hydrogen bonds.

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