The monograph describes the reactivity of organic compounds, types of chemical bonds, types of reactions in organic Chemistry, named reactions. The mechanisms of organic reactions have been interpreted on the basis of modern knowledge. This monograph is aimed at students of universities and other higher educational institutions in the field of chemistry. It can also be used by talented students of schools, academic lyceums, colleges, Olympic participants, young teachers, as well as employees of scientific research institutes. This monograph consists of 103 pages, 5 tables and 10 figures.