What is stronger non polar covalent or polar covalent?

Answer 1

There is no general answer to this question: One of the strongest of covalent bonds is that between two nitrogen atoms in a nitrogen molecule, which is non polar covalent. In contrast, a carbon-carbon single bond, also usually non polar covalent, is relatively weak. The polar covalent bond between hydrogen and fluorine in the gas phase is very strong, while a hydrogen-iodine bond is relatively weak.

Answer 2

Polar covalent bonds are generally stronger than nonpolar covalent bonds because the presence of partial charges in polar covalent bonds leads to stronger attractions between the bonded atoms. Nonpolar covalent bonds have equal sharing of electrons between atoms, resulting in weaker interactions.