Difference between SN1 and SN2|Organic chemistry||Alkyl Halides|Substitution reaction #pashtolecture

Difference between SN1 and SN2|Organic chemistry||Alkyl Halides|Substitution reaction #pashtolecture

## SN1 Reaction

SN1 stands for **Substitution Nucleophilic Unimolecular** reaction. It is a type of nucleophilic substitution reaction that occurs in two steps. In the first step, the leaving group separates from the substrate and forms a carbocation intermediate. In the second step, the nucleophile attacks the positively charged carbocation to form the final product. The rate of the reaction depends only on the concentration of the substrate, therefore it is called unimolecular. SN1 reactions are commonly shown by tertiary alkyl halides because they form stable carbocations. Weak nucleophiles and polar protic solvents such as water and alcohol favor this reaction. Rearrangement of carbocations may also occur during the reaction. The stereochemistry of the product is usually racemized because the nucleophile can attack from either side.

SN1 mechanism:
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