E1 and E2 eliminations parallel SN1 and SN1, and all four of these processes can compete with each other. Passing the first semester of organic chemistry usually requires not just learning these mechanisms, but recognizing how they can occur under different conditions and with different substrates. This is mastery of concepts. This work book series is designed to help students master concepts by encountering varied examples in self-study problems. Students who work the problems in this book without looking at the answers (www.byinquisition.org) will have no problem answering similar ones on an exam or final.