Isomerism The compounds have the same molecular formula but differ from each other in physical or chemical properties are called Isomers and the phenomenon is called Isomerism. Structural isomers are compounds that have the same molecular formula but different structural formulas. Chain Isomerism have the same molecular formula but differ in the order in which the carbon atoms are bonded to each other. Eg n-Butane and Isobutane Position Isomerism have the same molecular formula but differ in the position of a functional group on the carbon chain. Eg. n-propyl alcohol and Isopropyl alcohol Functional Isomerism have the same molecular formula but different functional groups. Eg. Ethyl alcohol and Dimethyl ether Metamerism have the same molecular formula but unequal distribution of carbon atoms on either side of the functional group. Eg. Deethyl ether and Methy propyl ether...... This book has been written for the BE/B.Tech students of All University with latest syllabus for B.Pharm/D.Pharm/ECE, EEE, CSE, IT, Mechanical, Bio Medical, Bio Tech, BCA, MCA and All B.Sc Department Students. The basic aim of this book is to provide a basic knowledge in Pharmaceutical Organic Chemistry. Pharmaceutical Organic Chemistry for engineering students of degree, diploma & AMIE courses and a useful reference for these preparing for competitive examinations & Higher Studies exams. All the concepts are explained in a simple, clear and complete manner to achieve progressive learning This book is divided into five chapters. Each chapter is well supported with the necessary illustration practical examples and solved problems.