The relative stabilities of N2, N2 + and N2 - are

1. N2> N2 +=N2 -

2. N2= N2 +>N2 -

3. N2< N2 +=N2 -

4. N2= N2 +<N2 -

The correct answer is 1) N2 > N2+ = N2-

Bond order in N2 is 3, while in both N2+ and N2- the bond order is 2.5. More is the bond order, more is the stability. Hence, N2 is more stable than N2+ and N2-, which have same bond order. 

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