The number of antibonding electrons in a molecule of carbon monoxide are:

According to $\mathrm{MOT},{\mathrm{O}}_2$ is paramagnetic in nature, what is the number of electrons in anti bonding molecular orbitals?

Given the species ${\mathrm{N}}_2,\mathrm{ }\mathrm{C}\mathrm{O},\mathrm{ }{\mathrm{N}\mathrm{O}}^{+}$ and ${\mathrm{C}\mathrm{N}}^{-}$ which of the following statements are true for them:

(I) All the species are diamagnetic.

(II) All the species are isostructural.

(III) All the species have identical bond order.

(IV) More than one species have zero dipole moment.