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Consider the ions/molecules − − + 2 2 2 2 2 O , O , O , O For increasing bond order the correct option is:

1. + − − < < < 2 2 2 2 2 O O O O
2. + − − < < < 2 2 2 2 2 O O O O
3. 2 2 2 2 2 O O O O < < < + − −
4. 2 2 2 2 2 O O O O < < < − + −

Correct answer: + − − < < < 2 2 2 2 2 O O O O

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