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The stability of a carbocation (C⁺) depends on how many other carbon atoms are bonded to it. This results in S_N1 reactions usually occurring on atoms with at least two carbons bonded to them. A more detailed explanation of this can be found in the main SN1 reaction page.The S_N2 mechanism has just one step. The attack of the reagent and the expulsion of the leaving group happen simultaneously. This mechanism always results in inversion of configuration. If the substrate that

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