how do the melting and boiling points o the hydrocarbons change with increase in molecular mass?

Define melting and boiling points.

Why boiling and melting points of hydrocarbons are low ?

The melting point and boiling point of water are

Account for the following : Nitro compounds have higher boiling points that the hydrocarbons having almost the same molecular mass.

Nitro compounds have higher boiling points than hydrocarbons having almost the same molecular mass?

The boiling points of halogens increase with increase in molecular weight, it is because

The boiling points of halogens increase with increase in molecular weight, it is because