Which of the following hydrogen halides has the highest boiling point?

In which of the following compounds does hydrogen bonding occur?

In which of the following compounds is hydrogen bonding $NOT$ present?

Why does water show a high boiling point compared to hydrogen sulphide? Give reasons for your answer.

Number of molecules from the following which can exhibit hydrogen bonding is $..........$ (nearest integer).
$CH_3OH, H_2O, C_2H_6, C_6H_6, \text{o-nitrophenol}, HF, NH_3$

The boiling point of a compound is raised by