What do you mean by polar molecules and non-polar molecules? Give one example each.

Polar and Non-Polar Molecules: Molecules can be grouped as polar or non-polar molecules. Some molecules are in between the two. The arrangement or geometry of the atoms in some molecules is such that one end of the molecule has a positive electrical charge and the other side has a negative charge.

Examples of polar molecules: Water-$H_{2}O$, Ammonia-$N{H}_3$,Sulphur dioxide-${SO}_2$ etc.

Examples of non-polar molecules:Benzene-$C_6{H}_6$, Methane-${CH}_4$,Hydrocarbon liquids such as gasolene and toluene etc.