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N2 and O2 are converted into monoanions, N2− and O2− respectively. Which of the following statements is wrong?

1. In N2− the N—N bond weakens
2. In O2− the O—O bond order increases
3. In O2− bond length decreases
4. N2− becomes diamagnetic

Correct answer: In N2− the N—N bond weakens

Solution

N2− has an additional electron in the antibonding π* orbital, weakening the N—N bond.

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