Which one of the following is paramagnetic?

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(B) Paramagnetic substances contain one or more unpaired electrons.According to Molecular Orbital Theory $(MOT)$:$N_2$ (total $14$ electrons): $({\sig

Vedclass · Accepted Answer

$NO$

Vedclass · Answer

(B) Paramagnetic substances contain one or more unpaired electrons.According to Molecular Orbital Theory $(MOT)$:$N_2$ (total $14$ electrons): $({\sigma}1s)^2 ({\sigma}^*1s)^2 ({\sigma}2s)^2 ({\sigma}^*2s)^2 ({\pi}2p_x)^2 ({\pi}2p_y)^2 ({\sigma}2p_z)^2$. All electrons are paired, so it is diamagnetic.$NO$ (total $15$ electrons): $({\sigma}1s)^2 ({\sigma}^*1s)^2 ({\sigma}2s)^2 ({\sigma}^*2s)^2 ({\sigma}2p_z)^2 ({\pi}2p_x)^2 ({\pi}2p_y)^2 ({\pi}^*2p_x)^1$. It has one unpaired electron in the antibonding ${\pi}^*$ orbital, so it is paramagnetic.$CO$ (total $14$ electrons): Similar to $N_2$, it is diamagnetic.$O_3$ (total $24$ electrons): It is a diamagnetic molecule.Therefore, $NO$ is the correct answer.

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