This textbook is intended for undergraduate and postgraduate students in organic chemistry.  It describes the synthesis and properties of cycloalkanes compounds such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane and cycloheptatriene. It further covers the chemistry of ring compounds. The book also covers the reaction mechanisms of non-benzenoid aromatic compounds including annulenes, metallocenes and azulenes. It further contains discussions on tropone, tropolones, fluxional molecules, catenanes and rotaxanes. End-of-chapter exercises such as multiple-choice questions and short answer-questions help students in self-learning. This textbook is useful for undergraduate and postgraduate students in organic chemistry.