(a) Like ammonia, amines are polar compounds and except `3^o` amines can form intermolecular `H`-bonds that's why they have higher boiling points.

Boiling points of `1^o`, `2^o` and `3^o` amines follow the order.

`1^o > 2^o > 3^o` amine.

(b) Unlike other organic compounds, amines are much more soluble in water. Because all amines form a stronger `H`-bond with water.

(c) Solubility in water follow the order.

`1^o > 2^o > 3^o` amine.

It is all due to `H`-Bonding.

(d) Boiling points of amines are lesser than alcohols and acids of comparable mol. weight. Because bonding in amines is less pronounced in `1^o` and `2^o` than that in alcohols and carboxylic acids. Because nitrogen is less electronegative than oxygen.