JEE Main 202127 Jul, Evening shiftChemistryEasyClassification of Elements and Periodicity in Properties127× since 2002The correct order of first ionisation enthalpy is :AOption A. Mg < S < Al < PBOption B. Mg < Al < S < PCOption C. Al < Mg < S < PDOption D. Mg < Al < P < SCheckSkip · show solution