The correct order of volatility is:

The boiling points of $HF$, $HCl$, $HBr$ and $HI$ follow the order:

Orthophosphoric acid $(H_3PO_4)$ exhibits high viscosity due to:

The molecular interactions responsible for hydrogen bonding in $HF$ are:

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 does hydrogen bonding not play a role in its boiling point?