Distinguish between polar and non-polar covalent bonds with respect to
(i) mode of formation
(ii) Charge separation
(iii) type of atoms involved in bond formation.

Explanation

(i) Polar covalent bond is a bond formed by unequal sharing of electrons between the bonded atoms. Non-polar covalent bond is a bond formed by equal sharing of electrons between the bonded atoms.
(ii) Polar covalent bond results in the formation of opposite partial charges on the bonded atoms, which is called dipole. Non-polar covalent bond does not result in charge separation between bonded atoms.
(iii) Polar covalent bond is formed between atoms of different elements. Non-polar covalent bond is formed between atoms of same element.