Which of the following options represents the correct bond order?

From the following,identify the ions with the same bond order.
$I$. $CN^{-}$
$II$. $N_2^{+}$
$III$. $O_2^{2-}$
$IV$. $NO^{+}$

$KO_2$ exhibits paramagnetic behaviour. This is due to the paramagnetic nature of

Which of the following species is paramagnetic?

The energy of $\sigma 2p_z$ molecular orbital is greater than $\pi 2p_x$ and $\pi 2p_y$ molecular orbitals in nitrogen molecule. Write the complete sequence of energy levels in the increasing order of energy in the molecule. Compare the relative stability and the magnetic behaviour of the following species : $N_2, N_2^+, N_2^-, N_2^{2+}$

In the following,the correct bond order sequence is: