Number of molecules having bond order $2$ from the following molecules is: $C_2, O_2, Be_2, Li_2, Ne_2, N_2, He_2$

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

Explain in short: $MO$ occupancy and molecular properties for $B_2, C_2, N_2, O_2, F_2, Ne_2$.

The incorrect statement regarding molecular orbital $(s)$ 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

In which of the following is the $O-O$ bond distance minimum?