The Fifth Volume of SGtOC includes the following topics: chemistry of polynuclear aromatic hydrocarbons, design of organic synthesis including retrosynthetic analysis, Favorskii rearrangement, chemistry of heterocyclic compounds containing one heteroatom in the ring, and a comprehensive comparative account of intramolecular and intermolecular reactions, including a detailed coverage of Baldwin’s rules for ring closure. Written in a lucid and student friendly conversational tone, the book aims to develop the basic  understanding of organic chemistry suitable for an undergraduate and graduate audience with an emphasis on synthetic organic chemistry. The text is supplemented with scores of problems, the solution to which ae supplied at the end of each chapter, thus this book is suitable for use as a self study guide. Additional problems are also provided for each chapter which offers opportunity for testing problem-solving skills. Advanced level problems have been designed to cater the need of aspirants of different competitive examinations including IIT-JAM. The present volume is ideal to be adipted in the fifth semester of three-year long organic chemistry curriculum.