Why do hydrgon compounds in group 17 have such low boiling points?

Question

between group 14,15, and 16 there is a patern between the boiling points with the boiling point being higher for the higher group- but group 17 dosn't fit the pattern it has lower boiling point then group 15 - why? As well how do you explain the anomalies such as water?

Answer 1

It is the anomalous behaviour of NH3, H2O and HF which is far more important than why the other hydrogen halides have slightly lower attractive intermolecular forces.

You need to look up the whole topic of hydrogen bonding.