The property of halogens which is not correctly matched is

Step-by-step solution

Down the group, electron gain enthalpies become less and less negative with the increase in the size of the halogen. However, electron gain enthalpy of F is less negative than Cl . This is due to small size of F-atom. As a result, there are strong inter electronic repulsions in the relatively small 2 p -orbitals of F and thus incoming electrons experience much less attraction. Thus, the correct order is Cl > F > Br > I .