Which of the following is paramagnetic?

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(A) The electronic configuration of $O_2$ ($16$ electrons) according to Molecular Orbital Theory is:$O_2 = \sigma(1s)^2 \sigma^*(1s)^2 \sigma(2s)^2 \s

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$O_2$

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(A) The electronic configuration of $O_2$ ($16$ electrons) according to Molecular Orbital Theory is:$O_2 = \sigma(1s)^2 \sigma^*(1s)^2 \sigma(2s)^2 \sigma^*(2s)^2 \sigma(2p_z)^2 \pi(2p_x)^2 = \pi(2p_y)^2 \pi^*(2p_x)^1 = \pi^*(2p_y)^1$Since the molecule contains two unpaired electrons in the antibonding $\pi^*$ orbitals,it exhibits paramagnetic behavior.In contrast,$CN^-$,$CO$,and $NO^+$ are all isoelectronic with $14$ electrons and have no unpaired electrons,making them diamagnetic.

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