Pericyclic Reactions and Photochemistry is a comprehensive textbook offering clear insights into two advanced areas of organic chemistry. Tailored for undergraduate and postgraduate students, it covers electrocyclic reactions, cycloadditions, sigmatropic rearrangements, and photochemical processes with emphasis on mechanisms, stereochemistry, and real-world applications. Concepts like Woodward-Hoffmann rules, Jablonski diagrams, and photophysical pathways are explained with clarity. Rich with diagrams, solved problems, and aligned lab experiments, the book connects theoretical understanding with practical relevance in fields like pharmaceuticals and green chemistry—making it an essential academic and research companion in modern organic chemistry.