Which of the following is paramagnetic?

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(D) $CN^{-}$,$CO$,and $NO^{+}$ are isoelectronic with $14$ electrons each,and there are no unpaired electrons in the Molecular Orbital $(MO)$ configur

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$O_{2}^{-}$

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(D) $CN^{-}$,$CO$,and $NO^{+}$ are isoelectronic with $14$ electrons each,and there are no unpaired electrons in the Molecular Orbital $(MO)$ configuration of these species.Therefore,these are diamagnetic.$O_{2}^{-}$ has $17$ electrons and is paramagnetic due to the presence of one unpaired electron in its antibonding $\pi^{*}$ orbital.$(CN^{-}, CO, NO^{+}) \; 14 \; e^{-} = \sigma 1s^{2}, \sigma^{*} 1s^{2}, \sigma 2s^{2}, \sigma^{*} 2s^{2}, \sigma 2p_{z}^{2}, \pi 2p_{x}^{2} \approx \pi 2p_{y}^{2}$ (No unpaired electron,diamagnetic).$O_{2}^{-} = \sigma 1s^{2}, \sigma^{*} 1s^{2}, \sigma 2s^{2}, \sigma^{*} 2s^{2}, \sigma 2p_{z}^{2}, \pi 2p_{x}^{2} \approx \pi 2p_{y}^{2}, \pi^{*} 2p_{x}^{2} \approx \pi^{*} 2p_{y}^{1}$ (One unpaired electron,paramagnetic).

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