During the last few years, the boards of studies in M.Sc chemistry of the various universities in India have been trying to overhaul and modernize the syllabi at the under-graduate and post-graduate level. The authors seek justification in presenting the present volume in the sincere attempts that they have made to fill up the gap. This book is written exclusively for student of various chemistry post graduate having different specializations in chemical sciences, keeping in view their practical requirements, after entering into their professional life. This book embodies three chapters which are of basic importance in the curriculum of M.Sc chemistry students and provide a core course of organic chemistry, B.Sc for all branches of sciences. Each chapter consists of a methodical introduction, discussion of basic physicochemical principles involved and practical application & significances.