Quantum mechanics provides the basis for solution of molecular structure and group theory is the mathematics, which serves as a link between the molecular symmetry and quantum mechanics. Therefore, the knowledge of group theory is essential to understand the structural aspects of molecules.

The basic purpose of the present book is to describe the fundamental concepts related to symmetry and group theory and to discuss their applications, in lucid manner with optimum mathematical part, which is required to understand the chemical problems. The book is divided into ten chapters emphasizing on the concepts and applications of group theory. It is tried to include enormous and sufficient number of examples to explain the concepts. Hope that this book will definitely serve the purpose and prove to be useful for the students who are pursuing their studies in this subject at graduation or post-graduation level.

Applications of Computer in Chemistry are now a part of curriculum in B.Sc. and M.Sc. classes of most of the Universities. This portion has been introduced by U.G.C. in the model course curriculum as well. The present book focuses on the use of this electronic machine in dealing with the problems of chemistry. Main attention has been focused on development of programming logic and technique particularly dealing with the problems of Chemistry, which should be the most important part before actually writing any Computer program. Fundamentals of three languages viz. BASIC, FORTRAN and C-Language, have been included in this book. Most of the programs in this book are given in BASIC language as it is easy to learn and interactive too. Ample programs are also given in FORTRAN and C-Language. It is has been tried to include all the programs in this book with their outputs. Hope this book will serve the purpose and will prove to be useful for the students pursuing studies in Chemistry at B.Sc. or M.Sc. level.

CONTENTS
Introduction to Computers; Fundamental Concepts of Programming; Ms-Dos and its Use; Fundamentals of Basic Programming; Fundamentals of FORTRAN Programming; Fundamentals of C-Language; some Useful Programs in Chemistry; etc.

Organic Photochemistry and Pericyclic Reactions has been written to meet the long-felt need of B.Sc. and M.Sc. Chemistry students. This book is an outstanding attempt to hold the interest of inquisitive students. The book also covers basic concepts, which may prove helpful in understanding the chapters at the later stage. Every topic covered in this book can do full justification for most of the students. Each chapter included in this book has been self-sufficient in it and has been explained with mechanisms, where possible Moreover, each topic has been discussed in the light of modern developments in a simple language and lucid style.

The present book on Solid State Chemistry has been written to cover the complete syllabus in such a manner that students do not get confused while going through this book. Each topic included in this book is self-sufficient in the light of recent developments and research in a simple and elegant style. Throughout this book, it is assumed that the students understand the fundamental concept in physical chemistry. Each topic covered in this book will do full justification for most of the students.