According to MO theory which of thhe following lists makes the nitrogen species in terms of increasing bond order?

Options

A. `N_2^(2-) lt N_2^(-) lt N_2`
B. `N_2 lt N_2^(2-) ltN_2^(-)`
C. `N_2^(-) lt N_2^(2-) lt N_2`
D. `N_2^(-) lt N_2 lt N_2^(2-)`

Answer

A

Explanation

The electron configuration of `N_2` is
`KK(sigma2s)^2(sigma^**2s)^2(pi2p_x^2=pi2p_y^2)(sigma2p_z)^2`
Thus, `N_2 bo=(10-4)/(2)=3`
`N_2^(-) bo =(10-5)/(2)=2.5`
`N_2^(2-) bo =(10-6)/(2)=2.0`
Thus, the correct order of increasing bo is
`N_2^(2-) lt N_2^(-) lt N_2`