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(A) According to Molecular Orbital Theory $(MOT)$, the electronic configuration of $O_2$ is $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \

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$O_2$

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(A) According to Molecular Orbital Theory $(MOT)$, the electronic configuration of $O_2$ is $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2 = \pi 2p_y^2, \pi^* 2p_x^1 = \pi^* 2p_y^1$.Since $O_2$ contains two unpaired electrons in the $\pi^*$ antibonding molecular orbitals, it exhibits paramagnetism.$O_3$, $N_2$, and $F_2$ are diamagnetic because they do not contain any unpaired electrons.

Which among the following molecules exhibits paramagnetism?

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