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Question

Chemistry Question on Molecular Orbital Theory

Which of the following molecules/ions does not contain unpaired electrons ?

A

O22−O_{2}^{2-}

B

B2B_{2}

C

N2+N_{2}^{+}

D

O2O_{2}

Answer

O22−O_{2}^{2-}

Explanation

Solution

O22−O_{2}^{2-} (Total number of electrons = 18) σ1s2,σ∗1s2,σ2s2,σ∗2s2,σ2px2,π2px2\sigma 1s^{2}, \sigma^{* } 1s^{2}, \sigma2s^{2}, \sigma^{* } 2s^{2},\sigma2p_{x}^{2}, \pi 2p_{x}^{2} =π2py2π∗2px2=π∗2py2=\pi 2p_{y}^{2} \pi^{ *} 2p_{x}^{2}=\pi^{* } 2p_{y}^{2}