In $O_2^-$,$O_2$,and $O_2^{2-}$,the total number of antibonding electrons respectively are:

In which of the following processes,the bond order increases and paramagnetic character changes to diamagnetic one?

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 bond lengths of $C_2$,$N_2$ and $B_2$ molecules are $X_1$,$X_2$ and $X_3$ $pm$ respectively. The correct order of their bond lengths is

Consider the following changes $I$ and $II$ as shown in the figure. The correct statements about these changes $(I)$ and $(II)$ in accordance with $MO$ theory are:
$A$) In $(I)$ bond order increases by $0.5$ from the existing value.
$B$) In $(II)$ bond order decreases by $0.5$ from the existing value.
$C$) In both $(I)$ and $(II)$ magnetic property is changed.
$D$) In both $(I)$ and $(II)$ magnetic property is not changed.

According to $MOT$,which of the following is correct?