JEE Advanced 2014 Chemistry question

Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is

Answer: (C)

Solution

Without s–p mixing the MO order is σ2s < σ*2s < σ < π = π < π*2p < σ*. (4 valence e⁻): σ2s² σ*2s² — diamagnetic. (6): …

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Question ID VK-026333