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  4. Which of the following molecules have unpaired electrons in antibonding molecular orbitals?

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Q. Which of the following molecules have unpaired electrons in antibonding molecular orbitals?

J & K CETJ & K CET 2002

Solution:

The molecular electronic configuration of $O_{2}$ molecule is as:
$O_{2}: K K(\sigma 2 s)^{2}\left(\sigma^{*} 2 s\right)^{2}\left(\sigma 2 P_{z}\right)^{2}\left(\pi 2 p_{x}\right)^{2}\left(\pi 2 p_{y}\right)^{2}\left(\pi^{*} 2 p_{x}\right)^{1}\left(\pi^{*} 2 P_{y}\right)^{1}$
Hence, $O_{2}$ molecule has unpaired electron in the anti-bonding molecular orbitals.