Question

What are SN2 reactions?

Answer 1

A common reaction mechanisme in organic chemistry

Explanation:

An `S_n2` reaction, S-ubstitution n-ucleophilic bi-molecular, is a reaction where the bond in a substrate is broken and a new formed simultaneously (in only one step). A `S_n2` reaction could look like this:

This all happens in one step. The [ ] is an intermediate.
Note a change in stereochemistry, from an S-configuration carbon to an R-configuration carbon