Which is not paramagnetic

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

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

When $\psi_{\mathrm{A}}$ and $\Psi_{\mathrm{B}}$ are the wave functions of atomic orbitals, then $\sigma^*$ is represented by :

The correct statement$(s)$ about $O _3$ is (are)

$(A)$ $O$ – $O$ bond lengths are equal.

$(B)$ Thermal decomposition of $O _3$ is endothermic.

$(C)$ $O _3$ is diamagnetic in nature.

$(D)$ $O _3$ has a bent structure.