Why is the boiling point of $H_2O$ higher than that of $H_2S$?

Intramolecular hydrogen bonding 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 $(b.p.)$?

Which of the following has maximum volatility?

Which compound forms a linear polymer due to $H$-bonding?

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