This textbook has been designed to meet the needs of B.Sc. Fourth Semester students of Chemistry as per Common Minimum Syllabus prescribed for Ranchi University and other Universities and Colleges under the recommended National Education Policy 2020 in Jharkhand. The book dive into the fascinating world of Organic and Inorganic Chemistry with this comprehensive guide, precisely shaped to serve to students and professionals. Covering a wide spectrum of topics, this book provides an in-depth understanding of fundamental and advanced concepts. The First Part: Organic Chemistry covers the topics such as Halogenated Hydrocarbons, Alcohols, Phenols, Ethers, and Epoxides, Aldehydes and Ketones, Carboxylic Acids and Derivatives, Active Methylene Compounds, Sulfur-Containing Compounds, Nitrogen-Containing Functional Group. The second part of the book delves into Inorganic Chemistry, with a detailed study of the s- and p-block elements, their unique properties, and compounds like silanes, boranes, and interhalogens. It also covers Noble Gases, Transition Elements, Coordination Chemistry, Lanthanides and Actinides. In the Practical Part, book covers Organic Qualitative Analysis, Organic Preparations, Spot Analysis and Inorganic Qualitative Micro Analysis. The book serves as an essential resource for academic success and professional advancement. Whether you're pursuing a degree, preparing for competitive exams, or seeking a deeper understanding of chemistry, this book is your ultimate companion.