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Which consequence results when promoting an electron from an antibonding molecular orbital to LUMO?

A)Increased bond dissociation energy
B)Decreased molecular orbital energy
C)Vibrational mode remains constant
D)Reduced bond order stability

💡 Explanation

Reduced bond order stability occurs because populating antibonding orbitals weakens molecular stability. The constructive interference no longer dominates; rather than stabilizing the molecule, electron repulsion destabilizes it, therefore the bond order weakens.

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