The molecular species having highest bond order is

Options

A. `O_2`
B. `O_2`
C. `O_2`
D. `O_2^2`

Answer

B

Explanation

`O_2 : (sigma_(1s))^2(sigma_(1s)^**)^2(sigma_(2s))^2(sigma_(2s)^**)^2 (sigma2p_z)^2 (pi2p_x)^2 (pi2p_y)^2 (pi2p_x^**)^1 (pi2p_y^**)^1 `
Bond order of `O_2=(N_b-N_a)/2=(10-6)/2=2`
Bond order of `O_2^(+)=(10-5)/2=5/2=2.5`
Bond order of `O_2^(-)=(10-7)/2=3/2=1.5`
Bond order of `O_2^(2-)=(10-8)/2=2/2=1`
Highest bond order (2.5) is in `O_2^(+)`.