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Using a simple molecular orbital treatment, the bond order of the hypothetical molecule OF would be:

1. 2
2. 1.5
3. 1.0
4. 0.5

Correct answer: 1.5

Solution

OF has 13 valence electrons; filling gives 8 bonding and 5 antibonding electrons, so bond order = (8-5)/2 = 1.5.

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