The primary difference is that a polar molecule possesses a net dipole moment, whereas a non-polar compound does not.In general, polar compounds are soluble in water, but non-polar molecules are not.The boiling points of polar compounds are greater for those with a lower molecular weight. For lighter compounds, this is due to dipole-dipole bonding, which is stronger than dispersion forces found in non-polar compounds.Non-polar molecules, on the other hand, have a lower boiling point, which makes them more volatile.