Can somemone help me please with these questions please>

Explain the following in terms of the intermolecular forces that exist.

a) Water is a liquid, but hydrogen sulphide is a gas.
b) Ethanol has a much higher boiling point than its isomers methoxymethane (CH3OCH3)
c) Pentan-1-ol boils at 137 C, whereas pentan-3-ol boils at 116 C.
d)The boiling point of sulphur dioxide is 24 C higher than that of chlorine.

Thanks.