elect the word or phrase that complete each sentence (consti…

elect the word or phrase that complete each sentence (constitutional isomers, diastereomers, enantiomers, meso compounds, higher, lower, reaction, addition, carbocation, carbanion, nucleophiles, electrophiles, elimination, heterolysis, homolysis, reagent, substitution, strong, weak, charge, concerted, two step, SN1, SN2, racemization, hyperconjugation, alkyl halides, inversion):  (   Good leaving groups are the conjugate bases of  ………………….. acids.  Complete word/phrase and correct spelling (verbatim) is required. No partial credit.