In the newly revised Thirteenth Edition of <i>Organic Chemistry</i>, a team of veteran chemistry educators delivers a practical exploration of the relationship between structure and reactivity. The book combines the most useful features of a functional group approach with an examination of reaction mechanisms. The book emphasizes the common aspects of mechanisms and the unifying features of functional groups. It demonstrates what organic chemistry is, as well as how it works. It relies heavily on examples from living systems and the physical world around us to illustrate crucial concepts.