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Which of the following pairs of species has identical bond order?

1. CN⁻ and NO⁺
2. CN⁻ and CN⁺
3. O₂⁻ and CN⁻
4. NO⁺ and CN⁺

Correct answer: CN⁻ and NO⁺

Solution

CN⁻ and NO⁺ both have a bond order of 3, as calculated from their molecular orbital diagrams, indicating that they share the same stability and strength of the bond.

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