In the course of undergratution, physical chemistry is the important part and students always need the subject content in easy language. We try to achieve the same.  The goal of this book is to build on the foundation of some concept of physical chemistry. Our purpose is to approach with easy concepts in chemistry. Students always need the book which contains theoretical chemistry in easy language. The book is intended to meet the need and requirement of undergraduate students. The book will also be useful to those students who are preparing for the various competitive examinations.
In the unit 1 contains basic structural properties of molecules and their physical aspects. Unit 2 contains photochemical aspects of molecules. Unit 3 is of spectroscopy which includes rotational, vibrational and Raman Spectroscopy in simple language. Lastly, unit-4 is having information about nuclear chemistry.
It is hoped that this book would be useful and effective in helping the students of chemistry. We shall welcome constructive criticism and suggestions with a view to improving upon our present effort