the melting points of polar molecular solids are higher than those of non polar molecular solids yet most of these are gases and liquids at room temperature why ?

Any help is appreciated.

Melting point of Polar molecular solids are higher just because stronger intermolecular interaction and dipole-dipole interaction between molecules makes their melting point higher than Non-polar molecular solids.

This explains the higher melting point, but point to note is that melting points higher doesn't means that molecule is solid. It depends on level of intermolecule interaction they have. Depending on size and structure of molecule they will pack together, if due to restriction in size and structure he couldn't get packed very closely to form solid, it will form liquid or gases

Example: Water is polar molecule and it has liquid form due to structure of its basic molecule.