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Memorization is not exactly the way to go in organic chemistry. Sure, you will have to commit to memory certain things such as reagents used, catalysts, reaction conditions, solvents, etc... for your reactions. However, if you attempt to memorize EVERY reaction pathway without truly understanding it, listen to me closely and listen again...YOU WILL FAIL. 👎 The correct approach to learning organic chemistry is understanding the "why" and "how" of eaction reaction and mechanism. Ask yourself as you are introduced to a nucleophilic addition reaction, "Why does this primary amine react with an aldehyde or ketone to form an imine?" "How does this occur and why does this occur?" "Why won't 2-butanone react with pentanal?" As you do this, you will find it much easier to understand and apply all the reactions that are thrown at you...memorization will simply cause you trip ups and promote a superficial understanding of the subject matter. Big concept here for you to know if you haven't already taken organic chemistry: Opposite charges attract and like charges repel...nucleophiles, which are negatively charged or neutral and usually contain excess electrons, are attracted to electrophiles, which are positively charged. Once you understand that and see it over and over again, you will find organic chemistry is a great, yet demanding course, that is composed of relatively simple concepts. With that concept above, you will later be able to understand why 2-butanone won't react with pentanal.