Select the word or phrase that complete each sentence (const…

Select the word or phrase that complete each sentence (constitutional isomers, diastereomers, enantiomers, meso compounds, higher, lower, reaction, addition, carbocation, carbanion, nucleophile, electrophile, elimination, heterolysis, homolysis, reagent, substitution, stronger, weaker, charge, activation energy, enthalpy, entropy, catalyst, transition state, intermediate,  concerted, two step, SN1, SN2, E1, E2, racemization, hyperconjugation, alkyl halides, inversion):     In order for a process to be spontaneous, the change in …………………………….. should be positive. Complete word/phrase and correct spelling (verbatim) is required. No partial credit.