Using MO theory predict which of the following species has the shortest bond length ?

Options

A. `O_(2)^(2o+)`
B. `O_(2)^(Θ)`
C. `O_(2)^(2-)`
D. `O_(2)^(o+)`

Explanation

Bond orders of `O_(2)^(2+), O_(2)^(o+) ,O_(2)^(Θ)` and `O_(2)^(2-)` are `3,2.5,1.5`
and 1.0 respectively and bond order `prop (1)/("Bond length")`
Hence `O_(2)^(2+)` has the shortest bond length .