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Which of the following pairs of species have the same bond order?

1. O2, NO+
2. CN−, CO
3. N2, O2−
4. CO, NO

Correct answer: CN−, CO

Solution

The bond order of CN− and CO is 3 in both cases. CN− has a triple bond due to its molecular orbital configuration, and CO also has a triple bond as per its molecular structure.

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