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(B) To determine the presence of unpaired electrons in antibonding molecular orbitals,we write the $MO$ configurations:$C_2$ ($12$ electrons): $\sigma

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$O_2, He_2^+$

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(B) To determine the presence of unpaired electrons in antibonding molecular orbitals,we write the $MO$ configurations:$C_2$ ($12$ electrons): $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2 = \pi 2p_y^2$. (No unpaired electrons).$O_2$ ($16$ electrons): $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2 = \pi 2p_y^2, \pi^* 2p_x^1 = \pi^* 2p_y^1$. (Has $2$ unpaired electrons in antibonding $\pi^*$ orbitals).$He_2^+$ ($3$ electrons): $\sigma 1s^2, \sigma^* 1s^1$. (Has $1$ unpaired electron in antibonding $\sigma^*$ orbital).Thus,the pair $O_2$ and $He_2^+$ both contain unpaired electrons in their antibonding molecular orbitals.

Which of the following pairs of species have unpaired electrons in antibonding Molecular Orbital?

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