Why O2+ has very strong o-o bond

=Dear student

Bond strength is directly proportional to the bond order. So we can tell why O₂⁺ has strong O-O bond on calculating bond order.
             $Bond order = \frac{electron in bonding orbital - electron in antibonding orbital}{2}$
     Bond can be calculated with the help of molecular orbital diagram



Bond order of O₂ = 8-4/2 = 2
In O_2⁺ , one electron is less than  O₂  so the bond order of  O₂^​+ is: 8-3/2 = 5/2 = 2.5

High bond order, so strong O-O bond.

Regards