Question

The hydrides of N, O and F have higher boiling point than subsequent group members? Give reason

Answer 1

In electro negativity character F>O>N >>> ANYTHING ELSE
So these molecules attract the hydrogen of the neighbouring molecule on a hydride thus forming hydrogen bond. It is a strong bond and this increases boiling point.
Whereas the subsequent members do not show hydrogen bonding.

Answer 2

this is due to higher electronegativity of N, O AND F atoms. they undergo extensive intermolecular H bonding which is very strong hence they have high boiling point PLS MARK THIS AS BRAINEST ANSWER