A substitution reaction is a form of chemical reaction where a functional group or an atom is substituted with a different functional group or atom. Substitution reactions fall into two main categories namely substitution nucleophilic unimolecular (SN1) and substitution nucleophilic bimolecular (SN2) reactions.1Â The SN2 substitution reaction occurs when the attacking atom or group is a strong nucleophile that hits the electrophile from the rear end thereby ousting the leaving group. SN2 reactions also occur in polar aprotic solvents. The ease of occurrence of SN2 reactions depends on the conformation of the alcohol. Overall, SN2 reactions occur with more ease in methyl alcohol than in secondary and tertiary alcohols because there is a less steric hindrance that enables the nucleophile to â€˜attackâ€™ the substrate from the rear end.2Â SN2 reactions are one-step concerted reactions that do not have intermediates. In contrast, an SN1 reaction happens when the offensive group is a weak nucleophile or in the presence of a polar protic solvent. The progress of SN1 reactions involves a time-consuming rate-limiting stage where a carbocation is formed. The carbocation intermediate requires utmost stability. Therefore, SN1 reactions occur readily in tertiary alcohols.
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