A polar covalent bond occurs when electrons are exchanged in a covalent bond by atoms with different electronegativities. Find the molecule hydrogen chloride (HCl). To form an inert gas electron configuration, each atom in HCl requires one more electron.
The atom of chlorine is too heavy. The size of the atom, considering its electronegativity, is such that its electron density is too low for hydrogen bonds to form. This is why, while HF does, HCl does not demonstrate hydrogen bonding.