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Decreasing order of stability of O2+, O2, O2− and O2−2 is:

1. O2+ > O2 > O2− > O2−2
2. O2−2 > O2− > O2 > O2+
3. O2 > O2+ > O2− > O2−2
4. O2− > O2 > O2+ > O2−2

Correct answer: O2+ > O2 > O2− > O2−2

Solution

The stability of these species depends on their bond order, which decreases as electrons are added to antibonding orbitals. O2+ has the highest bond order, followed by O2, O2−, and O2−2.

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