The bond order in `O_2^-`ion is

Options

A. 2
B. 1
C. 2.5
D. 1.5

Answer

D

Explanation

The electronic configuration of `O_(2)^(-)`
`O_2^(-) to (sigma1s)^(2) (sigma^(**)1s)^(2)(sigma2s)^(2)(sigma^(**)2s)^(2)(sigma2p_(z))^2`
`(pi2p_(x))^(2)(pi 2p_(y))^(2)(pi^(**)2p_(x))^(2)(pi^(**)2p_(y))^1`
Bond order =1/2 `[N_(b)-N_a]`
=1/2 [10-7]=3/2=1.5