Question

how do you know if a molecule is polar or non polar?

Answer 1

By finding the electronegativity difference bonded atoms, one can easily find whether the bond is polar or non polar.

If the difference is above 2, the bonding is considered as ionic,.

If the difference is 1.7, the bond is considered as 50% ionic.

If the difference lies between 0.5 to 1.7 the bond is considered as polar covalent bond.

If the difference is below 0.5, the bond is considered as pure covalent bond

By seeing the bond polarities, one can easily find whether the molecule is polar or not.