Answer:
Cl-Cl
Step-by-step explanation:
The electronegativity difference would tell us if we have a polar or a non-polar bond. If we have an electronegativity difference below that 0.4 we will have a non-polar bond if we have an electronegativity difference above that 0.4 and below 1.9 we will have a polar bond.
The electronegativity values for all atoms are:
P= 2.1
Cl= 3
O= 3.5
H= 2.1
S= 2.5
When we do the electronegativity difference we will have:
P-Cl = 0.9 => Polar
O-H= 1.4 => Polar
S-Cl= 0.5 => Polar
H-Cl= 0.9 => Polar
Cl-Cl= 0 => Non-Polar