Which ONE of the following gives the bond orders of O2+ & O2 respectively? & how is bond order calculated?

Question

A 1.5 and 2.5
B 2.0 and 3.0
C 2.5 and 2.5
D 3.0 and 2.0
E 2.5 and 2.0

Answer 1

E) 2.5 and 2.0

The bond order is the number of electrons in molecular bonding orbitals minus the number of electrons in anti-binding orbitals divided by 2.

For O2+:
(8 -3)/2 = 2.5

For O2:
(8-4)/2 = 2