Which bond pair does not have a polar covalent bond? p – cl o – h s – cl h – cl cl – cl

The polar covalent bonds are originated when the atoms have different electronegativities but not as different as to form ionic bonds.

Here are the electronegativities of the elements involved:

element          electronegativity

P                     2.19
Cl                    3.16
O                     3.44
H                     2.20
S                     2.58

Of course, when the two atoms of the bond are the same, the bond is purely covalent, not polar.

So, the bondis in P-Cl, O-H, S-Cl, and H-Cl are polar covalent.

Cl - Cl bond is not polar covalent.

Cl -Cl

Chewy,wrapped,not in all white,the wrapper is clear