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The video presents the reaction mechanism of nucleophilic substitution - the difference between SN1 and SN2 reactions is discussed in particular. You can find this video here (with commentary option): http://www.alteso.de/reaktionsmechani... And you can find much more on the subject of reaction mechanisms here: http://www.alteso.de/reaktionsmechani... altesotube - the channel on YouTube that you are welcome to subscribe to alteso.de - the site for free chemistry tutorials and more Have fun and good luck!