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Elimination reactions occur, as a rule, by two mechanisms, E1 and E2, but each of these mechanisms can compete with the nucleophilic substitution mechanisms, SN1 and SN2. So, how do you know which one will occur? In today's MegaLesson, I explain the differences between these mechanisms, and I take the opportunity to explain an aspect that is always present in unimolecular reactions - the Carbocation Rearrangement. I hope you enjoy it. Contact for classes and consulting: www.universidadedaquimica.com.br