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Which one of the following species possesses a bond order equal to 3?

1. CO
2. CN-
3. NO+
4. O2+

Correct answer: CO

Solution

CO, CN- and NO+ are all isoelectronic with N2 (14 electrons) and have bond order 3, but O2+ has 15 electrons and a bond order of 2.5. Since the question is single-answer, CO is the standard intended choice as a bond-order-3 species.

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