COMEDK · Chemistry · 4. Chemical Bonding and Molecular Structure

The number of antibonding electron pairs in \(\mathrm{O}_{2}^{2-}\) molecular ion on the basis of molecular orbital theory is
[Atomic number of \(\mathrm{O}\) is 18 ]

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(C) 4

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Configuration of \(\mathrm{O}_{2}^{2-}=\sigma 1 s^{2}, \sigma^{n} 1 s^{2}, \sigma 2 s^{2}, \sigma^{n} 2 s^{2}\), \(\sigma 2 p_{x}^{2}, \pi 2 p_{x}^{2} \approx \pi 2 p_{y}^{2}, \pi^{4} 2 p_{x}^{2} \approx \pi \pi_{p}^{2}\). \(\therefore\) Number of antibonding electron pairs is…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

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Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The number of antibonding electron pairs in \(\mathrm{O}_{2}^{2-}\) molecular ion on the basis of molecular orbital theory is[Atomic number of \(\mathrm{O}\) is 18 ]

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The number of antibonding electron pairs in \(\mathrm{O}_{2}^{2-}\) molecular ion on the basis of molecular orbital theory is
[Atomic number of \(\mathrm{O}\) is 18 ]