Effects of pH on substitution reactions?

[Cereal_Killer]

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Hey, SDNers! I needed help with some Sn1 and Sn2 concepts.

How would the changes in pH influence the rate of Sn2 and Sn1 reactions?

Thanks in advance for the help!

 

[aldol16]

This is a very complex question that isn't easily answered and depends on the specific reagents as well. But in general, there is a framework for answering such questions. So what do you know about how SN1 and SN2 work? For instance, what is their rate-determining steps?