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The SN2 mechanism is a fundamental concept in organic chemistry, describing a type of nucleophilic substitution reaction. It involves a single step, where a nucleophile attacks a molecule, resulting in the replacement of a leaving group. This reaction is crucial in understanding various organic synthesis processes. Key Characteristics 1. *Bimolecular*: The reaction involves two molecules: the nucleophile and the substrate. This bimolecular nature is a defining feature of SN2 reactions. 2. *Concerted mechanism*: The reaction occurs in a single step, with no intermediates. This concerted mechanism is a key aspect of SN2 reactions, distinguishing them from other types of reactions. 3. *Stereochemistry*: The reaction results in inversion of configuration at the reaction site. This stereochemical outcome is a critical consideration in SN2 reactions, as it can impact the properties of the resulting product. Reaction Steps  1. *Nucleophilic attack*: The nucleophile attacks the substrate, ...