Organic Chemistry: Structure, Properties, and Reactions is a comprehensive exploration of the fascinating world of carbon-based compounds and their immense scientific and practical importance. This volume begins with fundamental concepts of atomic structure, bonding, and functional groups, and progressively builds toward advanced topics such as molecular geometry, physical and chemical properties, and mechanisms of organic reactions. With clarity and depth, it explains addition, elimination, substitution, and rearrangement reactions while emphasizing the importance of retrosynthetic strategies in synthesis. The book also highlights the role of spectroscopic methods like NMR, IR, and mass spectrometry in identifying and characterizing organic compounds. Beyond theoretical foundations, it bridges chemistry with real-world applications in pharmaceuticals, polymers, environmental studies, and industrial processes. It further examines the role of organic chemistry in biological systems, from biomolecules to enzyme catalysis, while addressing sustainability through the principles of green chemistry. By integrating history, practice, and future directions, this work provides both students and researchers with a strong framework to understand, analyze, and innovate within the dynamic field of organic chemistry. Rich in insights and practical relevance, it reinforces the significance of carbon chemistry as a cornerstone of science and technology.