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In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?

1. + ⎯→ ⎯ 2 2 O O
2. − ⎯→ ⎯ 2 2 2 O O
3. + ⎯→ ⎯ NO NO
4. + ⎯→ ⎯ 2 2 N N

Correct answer: + ⎯→ ⎯ NO NO

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