The molecule having one unpaired electron is

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(A) According to Molecular Orbital Theory $(MOT)$:$NO$ has a total of $15$ electrons ($7$ from $N$ and $8$ from $O$).The electronic configuration is:

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$NO$

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(A) According to Molecular Orbital Theory $(MOT)$:$NO$ has a total of $15$ electrons ($7$ from $N$ and $8$ from $O$).The electronic configuration is: $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2 = \pi 2p_y^2, \pi^* 2p_x^1$.Since there is one electron in the antibonding $\pi^* 2p_x$ orbital,$NO$ is paramagnetic and contains one unpaired electron.$CO$ ($14$ electrons) and $CN^{-}$ ($14$ electrons) are diamagnetic (zero unpaired electrons).$O_2$ ($16$ electrons) has two unpaired electrons in the $\pi^* 2p$ orbitals.

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