The boiling points of the hydrogen halides are listed below.

Question

HF 19°C
HCl –85°C
HBr –67°C
HI –35°C
Which of the following accounts for the relatively high boiling point of HF?
1. HF has the strongest H—X bond.
2. HF molecules form hydrogen bonds.
3. HF molecules have the strongest va der Waals forces.
Answer

Answer 1

You need to read about hydrogen bonding.