Comprehensive Formula Index: This compact manual consolidates a vast array of essential chemical formulas, definitions, and equations across Physical, Organic, and Inorganic Chemistry into a single, portable volume.\\r\\nEngineered for Portability: Featuring a \\\"Mini Pocket Size\\\" (Sahni Size 5) format, it is specifically designed for students to carry easily in a pocket or bag for quick revision during commutes or between classes.\\r\\nExtensive Content Depth: Despite its small physical footprint, the book contains 479 pages of detailed information, making it a surprisingly deep resource for competitive exam preparation like JEE, NEET, and board exams.\\r\\nUser-Friendly Layout: Authored by Sunil Oberoi, the book uses clear English terminology and a structured paperback format to help students quickly locate specific reactions or molecular structures.\\r\\nAcademic Revision Tool: It serves as an ideal \\\"cheat sheet\\\" for last-minute cramming, helping to reinforce memory of periodic table trends, valencies, and complex organic reaction mechanisms.