Which pair of molecules is not a polar bond? A.
N-O
B.
C-0
C.
О- Н
D.
O-O

D. O-O

Explanation:

Diatomic oxygen is made up of the same two elements, and they equally share the 4 electrons that make up the double bond between them. They're equally electronegative, which means that there are not any partial charges for each element. Since neither atom pulls harder, it's a non-polar covalent bond.