This completely new and innovative textbook provides a comprehensive account of pericyclic reactions and organic photochemistry for undergraduate and postgraduate courses. The approach is based on mechanism and reaction type, and the subject matter is developed and concentrated on better understanding rather than on merely grasping factual knowledge. Basics of the subject are explained in thorough details in this title. Important points are revisited and mentioned wherever they are relevant. This title provides over 200 excellent thought-provoking textual problems. Glossary and questions for self-assessment are given at the end of each chapter. The most important aspect of this book is Chapter 14 which contains about 400 problems and their solutions based on pericyclic reactions and photochemistry. Applied photochemistry is also discussed in the book.