HF has highest boiling point among hydrogen halides, because it has:

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Boiling points of hydrogen halides:

| HX | Boiling point |
|---|---|
| HF | 19.5°C (highest) |
| HCl | −85°C |
| HBr | −67°C |
| HI | −35°C |

HF has the highest boiling point because F is the most electronegative element and has a small size. This creates very strong intermolecular hydrogen bonds (F–H···F) that require significant energy to break.

The other HX molecules have only van der Waals forces (which increase from HCl to HI due to larger electron clouds), but none as strong as HF's hyd

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