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The correct order of bond orders of 2 2 2 2 2 2 C , N ,O − − − is respectively

1. 2 2 2 2 2 2 C N O − − − < <
2. 2 2 2 2 2 2 O N C − − − < <
3. 2 2 2 2 2 2 C O N − − − < <
4. 2 2 2 2 2 2 N C O − − − < <

Correct answer: 2 2 2 2 2 2 O N C − − − < <

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