Is o-cl Bond polar

Yes, Oxygen(O) is more electronegative and Chlorine(Cl). Therefore when they form a covalent bond between them. The electron density will be heavier towards the Oxygen atom.

But, in a molecule of Oxygen Dichloride(OCl2), there are two polar O-Cl bonds with O as the central atom. The polar bonds cancel each other out, resulting in the OCl2 molecule a non-polar molecule.