The ion that is isoelectronic with $CO$ is

Which of the following pairs have identical values of bond order?

Which of the following molecules has a bond order greater than $1$?

According to molecular orbital theory,the number of unpaired electron$(s)$ in $O_{2}^{2-}$ is :

According to Molecular Orbital Theory,which of the following statements is/are correct?
$(A)$ $C_2^{2-}$ is expected to be diamagnetic
$(B)$ $O_2^{2+}$ is expected to have a longer bond length than $O_2$
$(C)$ $N_2^{+}$ and $N_2^{-}$ have the same bond order
$(D)$ $He_2^{+}$ has the same energy as two isolated $He$ atoms

The paramagnetic nature of oxygen can be explained by