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Which outcome results when diatomic oxygen enters triplet spin state?

A)Increased biradical character
B)Enhanced diamagnetic susceptibility
C)Decreased bond order slightly
D)Higher electron transition energy

💡 Explanation

Increased biradical character occurs via Hund's rule as electrons preferentially singly occupy degenerate Pi antibonding molecular orbitals, because the triplet state minimizes electron repulsion; therefore, oxygen becomes more reactive as a diradical rather than remaining mostly paired electrons.

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