Explain and give examples about these concepts regarding SN1 reactions. - Non-stereospecific. Explain - Non-concerted. Explain - Unimolecular. Explain - Best if tertiary substrate or conjugated (benzylic or allylic) carbocation can be formed. Why? - Never primary substrate. Why? - Best if nucleophiles are more reactive (i.e. more anionic or more basic), Examples? - What about solvents used as nucleophiles? Examples? - Best if more stable leaving group (i.e. can support negative charge well) - Protic solvents. Examples