Per NCERT §4.7.4, the ORDER of MO energies that applies to O₂ and F₂ is which?
Aσ1s < σ2s < σ*1s < σ*2s
Bσ1s < σ*1s < σ2s < σ*2s < σ2p_z < (π2p_x = π2p_y) < (π*2p_x = π*2p_y) < σ*2p_z
Cσ*1s < σ1s < σ*2s < σ2s
DReverse of the standard order
Answer & Solution
Correct answer: B. σ1s < σ*1s < σ2s < σ*2s < σ2p_z < (π2p_x = π2p_y) < (π*2p_x = π*2p_y) < σ*2p_z
Per NCERT §4.7.4, for O₂ + F₂ + Ne₂: σ2p_z below π2p — the 'normal' order. For B₂, C₂, N₂: σ2p_z above π2p.
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