7.36     Arrange the following in the order of property indicated for each set:        (i)     $F_{2}$, $CI_{2}$, $Br_{2}$, $I_{2}$- increasing bond dissociation enthalpy.

Bond dissociation energy usually decreases as we move down in a group, Bond dissociation energy usually decreases as the atomic size increases. whereas, the bond dissociation energy of $F_2$ is lower than that of $Cl_2$and $Br_2$. This is due to the small atomic size of fluorine. hence,
$I_2< F_2