The species having bond order different from that in CO is

detailed solution

Correct option is A

The molecule ${\text{KO}}_2$ is a superoxide. The superoxide ion ${\text{O}}_2^{-}$ has paramagnetic nature because there is one unpaired electron in the anti bonding molecular orbital of ${\text{O}}_2^{-}$.

In KCN, cyanide ion ${\text{CN}}^{-}$ has diamagnetic nature because there are no unpaired electrons in the molecular orbital diagram of ${\text{CN}}^{-}$.

In ${\text{Na}}_2{\text{O}}_{\text{2}},{\text{\hspace{0.17em}Be}}_{\text{2}}{\text{O}}_{\text{2}}$, peroxide ion (${\text{O}}_2^{2-}$) has diamagnetic nature because there are no unpaired electrons in the anti bonding molecular orbitals of peroxide ion.