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Which of the following options represents the correct bond order?

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

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