Select the best word or phrase that completes each sentence:…

Select the best word or phrase that completes each sentence: (carbocation, carbanion, methyl, primary, secondary, tertiary, syn, anti, solvents, less, cis, trans, crown ethers, acidic cleavage, more, phenol, hydroperoxides, alkenes, alkanes, alkynes, alkyl halide, 1,2-hydride, 1,2-alkyl, inversion, epoxides, oxetanes, oxolanes, oxanes, ethers, alcohols, thiols, sulfides, disulfides, enols, chiral, achiral, nucleophilic substitution, elimination, addition, Markovnikov’s, Hammond’s, Zaitzev’s, Williamson’s).    Substituted oxiranes are also called  ………………………… .    Complete word/phrase and correct spelling (verbatim) is required. No partial credit.