Pharmaceutical Organic Chemistry-I is suitable for the second semester of B. Pharmacy students. The basic concepts of the structures, reaction mechanisms, synthesis, reactivities, and properties of organic molecules have been well discussed in the book. This helpful introduction to the in-depth chemistry course engages students and gives prospective and new scientists a novel approach to learning rather than simply memorising the main concepts underpinning this core field, with simple language and interesting examples. The book gives in-depth knowledge to students about the basics necessary for understanding core organic chemistry. While reading the textbook, one will be able to grasp important concepts of organic chemistry as plenty of reactions along with their mechanisms have been included, which will help students in the future. In addition to this, multiple-choice questions, as well as long answer questions, have also been included for practice.