Question

Which has a longer bond, N2-1 or N2? Justify your answer using bond order.

Answer 1

According to the molecular orbital theory :-

Electronic configuration of N2 :-

pi(2px)2 = pi(2py)2 sigma(2pz)2

Rest is already canceled in calculation of bond order

Here bond order is :-

6/2=3

Electronic configuration of N2-1 :-

pi(2px)2 = pi(2py)2 sigma(2pz)2 sigma star(2px)1 = sigma star(2py)

Rest is already canceled in calculation of bond order

Here bond order is :-

6-1/2=2.5

Since bond order of N2 is more, it have stronger bond and hence it is smaller

Therefore N2-1 has longer bond

NISHANT ABHANGI

(JEE ADVANCED 2019 AIR 6)