In the preparation of compounds of , Bartlett had taken as a base compound. This is because
(i) both and has the same size.
(ii) both and has the same electron gain enthalpy.
(iii) both and has almost same ionisation enthalpy.
(iv) both and are gases
The answer is the option (iii). The ionization enthalpy of is nearly equal to that of , because of which Barlett chose compounds as base.