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

1. N2− < N2 < N2+
2. N2+ < N2− < N2
3. N2 < N2− < N2+
4. N2− < N2+ < N2

Correct answer: N2+ < N2− < N2

Solution

According to Molecular Orbital (MO) theory, bond order is calculated as (number of bonding electrons - number of antibonding electrons)/2. For N2+, N2, and N2−, the bond orders are 2.5, 3, and 2, respectively. Thus, the correct order is N2+ < N2− < N2.

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