Question

According to MO theory which of the following lists ranks
the nitrogen species in terms of increasing bond order?
(a) N₂²⁻ < N₂⁻ < N₂ (b) N₂ < N₂²⁻ < N₂⁻
(c) N₂⁻ < N₂²⁻ < N₂ (d) N₂⁻ < N₂ < N₂²⁻

Answer 1

The nitrogen species in terms of increasing bond order is N2 ^2- < N2 - < N2

Option (A) is correct.

Explanation:

According to MOT, the molecular orbital

electronic configuration of

N2 : (cr lsi (cr x  lsi (cr2s)2 (cr x 2s)2 (1T2p / (n2p / (cr2pi

B.0 = 10 - 4 =3

2 N- : (cr ls)2 (cr x  lsi (cr2s)2 (cr x 2si (n2pi (np /  - (cr2p/ (n*2p)'

B.O= l0 - 5 = 2.5

2 N2 2

(crl s/ (cr x 1s)2 (cr2s)2 (cr x 2s)2 (n2pi (n2p/  cr2p  (n x 2pi (n x 2p)

B.O. = IO - 6 = 2. 2

Hence the order : N2 ^2- < N2 - < N2

Thus the nitrogen species in terms of increasing bond order is N2 ^2- < N2 - < N2.