Destroyer ochem 181

[Jordwin]

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I know the answer, but I thought SN2 didn't use polar protic solvents?

 

[dent777]

SN2 can use both, it is not the main priority for SN2.
Chad discussed it in detail.

P.S The key is to look at the base (nucleophile) bulky strong vs strong vs weak, carbon atom (primary vs. tertiary), leaving group. In this case, strong base (not bulky though), primary carbon with Br. Therefore, SN2. Iodine attached to benzene non reactive

 

[Dotoday]

If you have a primary halide or a good nucleophile, Sn2 can be done in a protic solvent.

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