(1) The "bond order" of $H_2, N_2\: and \: O_2$ follows the order $ N_2 > H_2 > O_2$
(2) In $ CsCl $ lattice, each Cs is surronded by 8 $Ci^-$ ions.
(3) The ionic nature of $ KCI, MgCL_2\: and \: AICI_3$ follows the order $ KCI > MgCI > AICI_3$
(4) The central atoms in $ PF_3 , CIF_3\: and \: XeF_2 $ have $ sp^3d$ hybridisation.
$\begin {array} {1 1} (1)\;(I) \: and \: (IV) & \quad (2)\;(II) \: and \: (III) \\ (3)\;(I) \: and \: (II) & \quad (4)\;(II) \: and \: (III) \end {array}$
