This is a reaction mechanism workbook designed to accompany a standard organic chemistry textbook. The book presents reaction mechanisms at three levels of difficulty: basic, moderate, and advanced. In Part A, the easiest, the missing curved arrows are missing. In Part B, the same problem is repeated with every other intermediate or product missing. In Part C, the problems are written in textbook fashion, and the same number of arrows have been retained. Thus, you are guided from learning the logic of a reaction to writing a complete mechanism. Once you have mastered a mechanism, you should be able to solve similar problems in your textbook. Part D gives completed mechanisms.