The SN1 reaction - A Nucleophilic Substitution in which the Rate Determining Step involves 1 component.

-SN1 reactions are unimolecular, proceeding through an intermediate carbocation.
-SN1 reactions give racemization of stereochemistry at the reaction centre.
-The first step is slower and therefore determines the rate.
-Neighbouring group participation is SN1 reactions can be important.

For example:

 

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