Bond order of $C_2$ vapour is :

According to Molecular Orbital Theory,

($A$) $\mathrm{C}_2^{2-}$ is expected to be diamagnetic

($B$) $\mathrm{O}_2{ }^{2+}$ is expected to have a longer bond length than $\mathrm{O}_2$

($C$) $\mathrm{N}_2^{+}$and $\mathrm{N}_2^{-}$have the same bond order

($D$) $\mathrm{He}_2^{+}$has the same energy as two isolated He atoms

During the change of $O _{2}$ to $O _{2}^{-}$, the incoming electron goes to the orbital :

According to the molecular orbital theory, the bond order in ${C_2}$ molecule is

Which one of the following molecules is paramagnetic

Which information obtained by electronic configuration of Molecule in $\mathrm{MO}$ ?