Identify a molecule which does not exist.

Observe the following molecules / ions $H_2, N_2, O_2, N_2^+, O_2^+, O_2^-, F_2$. Identify the correct statement.

What is the total number of electrons present in bonding orbitals of $O_2$ molecule according to molecular orbital theory?

During the change of $O_2$ to $O_2^-$ ion,the electron adds to which one of the following orbitals?

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.

The diamagnetic species among the following is $.....$