Stereochemistry has always occupied a central position and is pivotal to the practice of organic chemistry. A solid understanding of this subject is indeed critical to subsequent success in a science career. The new ninth edition provides more problems (and answers) and examples to help in understanding the material in each chapter in a much better way. The key features of this new edition are: The existing material has been extensively reorganized and rearranged for more systematic study. New material and examples have been added for better understanding. New material on assignment of R and S configuration has been added Major changes have been done in 7th chapter. Nucleophilic additions and additions-eliminations have been rewritten. Stereochemistry of addition to cyclohexanones has been expanded.