The strength of a hydrogen bond is intermediate between which of the following?

In which of the following,intramolecular hydrogen bonding is present?

Would you expect the hydrides of $N$,$O$ and $F$ to have lower boiling points than the hydrides of their subsequent group members? Give reasons.

Name two intermolecular forces that exist between $HF$ molecules in the liquid state.

$Statement-1$: $p$-Hydroxybenzoic acid has a lower boiling point than $o$-hydroxybenzoic acid.
$Statement-2$: $o$-Hydroxybenzoic acid has intramolecular hydrogen bonding.

$KF$ combines with $HF$ to form $KHF_2$. The compound contains the species