This book is designed to cover the "Basics principles Hetero-cyclic Chemistry, Data Analysis, Nomenclature of organic compounds and Hammet equation" Syllabus of M.Sc, B.Sc level courses and NEET,NET,SET,SLET,GATE,TIFR, BARC, NASA, NBRC, NCBI, CCMB, NCBS, IISC, ONGC, DRDO, AIIMS, NTPC, BEL, IGCAR, etc competitive examinations. It provides a very lucid explanation about Basics principles of chemistry and it covers the requirement of Indian and various other University level competitive examinations 2020-2021. It consists of five Chapters such as Hetero-cyclic Chemistry, Data Analysis, and Nomenclature of organic compounds, Hammet equation, and Boranes, Carboranes. It focuses, in clear and lucid language, on the basic scientific contents necessary to understand the latest issues. The salient features i. Lucid and elegant style ii. Dependable information about concepts iii.Sufficient examples for practice.