Ease of formation of the cation is favoured by (RPMT 2010)

Lower the value of ionisation potential, higher will be the ease of formation of the cation. The minimum amount of energy required to remove an electron from isolated gaseous atom (X) in its ground state is called the ionization enthalpy. i X g X g e , H ve -> Hence, lower value of ionisation enthalpy favours the formation of cation.