Bond order normally gives an idea of the stability of a molecular species. All the molecules,namely $H_2$,$Li_2$,and $B_2$,have the same bond order,yet they are not equally stable. Their stability order is:

$A$ molecule which contains unpaired electrons is

Explain the structure of the $O_2$ molecule.

The paramagnetic behaviour of $B_2$ is due to the presence of

The increasing order of bond order of $O_2, O_2^+, O_2^-$,and $O_2^{2-}$ is:

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.