Hydrogen bonding does not play a central role in the following phenomena:

Hydrogen bond is not present in

The boiling points of methanol,water,and dimethyl ether are respectively $65\,^{\circ}C$,$100\,^{\circ}C$,and $-24.8\,^{\circ}C$ (note: dimethyl ether is a gas at room temperature). Which of the following best explains these wide variations in boiling point $(b.p.)$?

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

Compounds showing hydrogen bonding among $HF, NH_3, H_2S$ and $PH_3$ are

Which of the following explains the viscous nature of glycerol?