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Among the species NO, NO+, NO2+, and NO-, which one has the weakest (minimum) bond strength?

1. NO2+
2. NO+
3. NO
4. NO-

Correct answer: NO-

Solution

Adding an electron to NO fills an antibonding pi* orbital, lowering bond order. NO+ has bond order 3, NO has 2.5, and NO- has 2 (the lowest), so NO- has the minimum bond strength among NO, NO+, NO-. (NO2+ is a different triatomic species.)

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