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The correct bond order in the following species is:

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

Correct answer: O2− < O2 < O2+

Solution

Bond order is calculated using the molecular orbital theory. O2+ has a bond order of 2.5, O2 has a bond order of 2, and O2− has a bond order of 1.5. Thus, the correct order is O2− < O2 < O2+.

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