Polar molecules have a uniform distribution of electron density. A nonpolar molecule have unequal distribution of electron density.
All covalent bonds which are polar in nature should be represented by pointing arrows toward a more electronegative atom. Polar molecules have a net dipole.
On the other hand Non-polar molecules do not have a net dipole. Polar molecules have a high boiling point and a high melting point. while Non-polar molecules have a low boiling point and a low melting point.
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