The third volume of SGtOC  includes the following topics: chemistry of alkenes, dienes and alkynes, Wittig and related definition reactions, formation and reactions of acetals and thioacetals, synthetic applications of nucleophilic substitution at saturated carbon, chemistry of organometallic compounds including transition metals and redox reactions. 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 are 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 adopted in the third semester of a three year long organic chemistry curriculum.