How many electrons are present in the antibonding molecular orbitals of the $O_2$ molecule?

What is the bond order of the $F_2$ molecule?

Which of the following pictorial diagrams most correctly represents the $\pi^*$ ($\pi$-antibonding) molecular orbital between two atoms if the internuclear axis is taken to be in the $z$-direction?

Which of the following species contains only $\pi$-bonds but exhibits paramagnetic nature?

Which of the following molecule$(s)$ show$(s)$ paramagnetic behavior?
$(A) O_2$ $(B) N_2$ $(C) F_2$ $(D) S_2$ $(E) Cl_2$
Choose the correct answer from the options given below:

Consider the following statements.
$I$. In the conversion of $O_2$ to $O_2^{2+}$,bond order decreases.
$II$. In the conversion of $O_2$ to $O_2^{2+}$,magnetic property is not changed.
$III$. In the conversion of $O_2$ to $O_2^{2+}$,bond length decreases.
$IV$. $O_2^{2-}$ and $B_2$ have same bond order.
Identify the correct statements.