Chemistry is a fundamental science that provides a molecular understanding of matter, its structure, properties, transformations, and applications. The development of modern chemistry has transformed the subject from the description of substances and reactions into a predictive and design-oriented science.
This book, Principles of Modern Chemistry: A Theoretical Perspective, presents chemistry through the central relationship between molecular structure, properties, and reactivity. Particular emphasis is placed on understanding how the arrangement of atoms, bonding, molecular geometry, electronic distribution, and functional groups govern chemical behaviour.
The theoretical perspective adopted throughout the book is intended to develop conceptual understanding rather than encourage the memorization of isolated facts and reactions. Organic chemistry provides a major foundation of this approach because the remarkable versatility of carbon gives rise to an enormous diversity of molecular structures.
The book introduces the development, classification, structural features, stereochemistry, conformational behaviour, and electronic characteristics of organic molecules in a systematic manner.
The text also emphasizes the importance of connecting molecular-level explanations with observable chemical properties and practical chemical applications. Modern developments in computational chemistry demonstrate how mathematical models and computer-based methods can provide insight into molecular structures, energies, interactions, and reaction behaviour. Artificial intelligence and machine learning are increasingly extending these capabilities by analysing chemical data, predicting properties, assisting reaction prediction, and supporting molecular and materials discovery.
At the same time, the future of chemistry must address environmental responsibility, resource efficiency, safety, and sustainable development. Green and sustainable chemistry therefore form an important part of the modern perspective presented in this book, linking chemical innovation with pollution prevention and responsible resource use. The integration of theoretical principles, computational methods, artificial intelligence, experimental validation, and sustainability reflects the interdisciplinary nature of contemporary chemistry. Such integration enables chemists to move progressively from observing chemical behaviour toward predicting, designing, controlling, and optimizing molecular systems.
The book is intended to provide students and learners with a coherent conceptual foundation for understanding both fundamental chemical principles and emerging directions in chemistry. It may also serve as a useful reference for readers interested in molecular design, pharmaceutical chemistry, materials science, chemical technology, and environmentally responsible chemical processes. Ultimately, the purpose of this book is to encourage readers to view chemistry not merely as a collection of compounds, equations, and reactions, but as a science of molecular reasoning, prediction, design, and innovation. It is hoped that this perspective will inspire deeper scientific understanding and provide a strong foundation for exploring the rapidly evolving frontiers of modern chemistry.
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Sr no. |
Title |
Page no. |
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Ch.01 |
STRUCTURE AND REACTIVITY |
1-20 |
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1.1 INTRODUCTION TO MODERN ORGANIC CHEMISTRY 1.2 MEANING OF ORGANIC CHEMISTRY 1.3 SCOPE OF ORGANIC CHEMISTRY 1.3.1 Hydrocarbons 1.3.2 Functionalized Organic Compounds 1.3.3 Natural Products 1.3.4 Synthetic Organic Chemistry 1.3.5 Medicinal Chemistry 1.3.6 Polymer and Materials Chemistry 1.3.7 Environmental Organic Chemistry 1.4 SIGNIFICANCE OF ORGANIC CHEMISTRY |
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Ch.02 |
HISTORICAL DEVELOPMENT OF ORGANIC CHEMISTRY |
21-38 |
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2.1 INTRODUCTION 2.2 STAGES OF DEVELOPMENT OF ORGANIC CHEMISTRY 2.2.1 Development of Structural Theory 2.2.2 Development of Stereochemistry 2.2.3 Electronic Theories of Organic Chemistry 2.3 MODERN ORGANIC CHEMISTRY 2.3.1 Organic Compounds in Biological Systems 2.3.2 Relationship between Molecular Structure and Chemical Properties 2.4 STRUCTURAL FACTORS GOVERNING ORGANIC PROPERTIES 2.4.1 Electronic Structure and Reactivity 2.4.2 Thermodynamic and Kinetic Aspects of Reactivity 2.4.3 Structure–Property–Reactivity Triangle 2.5 IMPORTANCE OF MOLECULAR SHAPE 2.5.1 Role of Organic Chemistry in Drug Design 2.5.2 Modern Computational Approaches 2.5.3 Green and Sustainable Organic Chemistry 2.5.4 Structure to Molecular Design |
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Ch.03 |
CLASSIFICATION OF ORGANIC COMPOUNDS |
39-54 |
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3.1 INTRODUCTION 3.2 OPEN-CHAIN AND CLOSED-CHAIN COMPOUNDS 3.3 ACYCLIC AND CYCLIC COMPOUNDS 3.4 HOMOCYCLIC AND HETEROCYCLIC COMPOUNDS 3.5 ALICYCLIC COMPOUNDS 3.6 AROMATIC AND HETEROAROMATIC COMPOUNDS 3.7 SATURATED AND UNSATURATED COMPOUNDS 3.8 CLASSIFICATION BASED ON FUNCTIONAL GROUPS 3.9 HOMOLOGOUS SERIES 3.10 STRUCTURAL REPRESENTATION OF ORGANIC MOLECULES |
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Ch.04 |
STRUCTURAL ISOMERISM |
55-71 |
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4.1 INTRODUCTION & CONCEPT OF ISOMERISM 4.2 CONSTITUTIONAL OR STRUCTURAL ISOMERS 4.3 CHAIN ISOMERISM 4.4 POSITION ISOMERISM 4.5 FUNCTIONAL-GROUP ISOMERISM 4.6 METAMERISM 4.7 RING-CHAIN ISOMERISM 4.8 TAUTOMERISM 4.9 IMPORTANCE OF STRUCTURAL ISOMERISM IN CHEMICAL PROPERTIES |
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Ch.05 |
STEREOISOMERISM |
72-91 |
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5.1 INTRODUCTION 5.1.1 Concept of Three-Dimensional Molecular Structure 5.2 CLASSIFICATION OF STEREOISOMERS 5.3 CONFIGURATIONAL AND CONFORMATIONAL ISOMERISM 5.4 ENANTIOMERS 5.5 DIASTEREOMERS 5.5.1 Importance of Diastereomerism 5.6 GEOMETRICAL ISOMERISM 5.7 OPTICAL ISOMERISM 5.8 BIOLOGICAL SIGNIFICANCE OF STEREOCHEMISTRY |
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Ch.06 |
CONFORMATIONS OF ORGANIC MOLECULES |
92-123 |
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6.1 INTRODUCTION 6.1.1 Concept of Molecular Conformation 6.2 ROTATION AROUND SIGMA BONDS 6.3 NEWMAN PROJECTIONS 6.3.1 Features of Newman Projection 6.4 SAWHORSE PROJECTIONS 6.4.1 Comparison of Newman and Sawhorse Projections 6.5 STAGGERED AND ECLIPSED CONFORMATIONS 6.6 ANTI AND GAUCHE CONFORMATIONS 6.6.1 Distinction Between Anti and Other Conformations of n-Butane 6.7 CONFORMATIONAL ENERGY 6.7.1 Factors Affecting Conformational Energy 6.8 CONFORMATIONS OF ETHANE 6.8.1 Principal Conformations of Ethane 6.9 CONFORMATIONS OF N-BUTANE 6.9.1 Relative Stability of n-Butane Conformations 6.10 RING CONFORMATIONS 6.11 CYCLOHEXANE: CHAIR, BOAT AND TWIST FORMS 6.11.1 Stability of Cyclohexane Conformations 6.12 AXIAL AND EQUATORIAL BONDS 6.12.1 Axial versus Equatorial Positions 6.13 RING FLIPPING 6.14 CONFORMATIONAL STABILITY 6.14.1 Factors Governing Conformational Stability 6.15 CONFORMATIONAL ANALYSIS AND MOLECULAR REACTIVITY 6.15.1 Conformational Analysis in Biological Systems 6.15.2 Significance of Conformational Chemistry |
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Ch.07 |
RESONANCE AND MESOMERIC EFFECTS |
124-148 |
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7.1 INTRODUCTION 7.2 CONCEPT OF RESONANCE 7.3 RESONANCE STRUCTURES AND RESONANCE HYBRID 7.3.1 Relationship among Resonance Structures, Resonance Hybrid 7.3.2 Rules for Writing Resonance Structures 7.3.3 Important Rules for Resonance Structures 7.3.4 Stability of Resonance Contributors 7.3.5 General Order of Importance 7.4 RESONANCE IN ALLYLIC AND BENZYLIC SYSTEMS 7.4.1 Essential Requirements - Allylic and Benzylic Resonance 7.5 RESONANCE IN CARBOXYLATES 7.5.1 Resonance in Aromatic Compounds 7.5.2 Mesomeric Effect 7.5.2.1 Important Mesomeric Effects 7.5.3 Resonance Effects on Acidity 7.5.4 Resonance Effects on Basicity 7.5.5 Resonance Effects on Molecular Stability 7.6 RESONANCE, CONJUGATION AND MOLECULAR STRUCTURE 7.6.1 Resonance and Electrophilic Aromatic Substitution 7.6.2 Resonance Effects in Biological and Pharmaceutical Chemistry 7.6.3 Resonance and Mesomeric Effects 7.6.4 Important Examples of Resonance Stabilization 7.6.5 Common Misconceptions about Resonance |
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Ch.08 |
HYPERCONJUGATION AND INDUCTIVE EFFECT |
149-181 |
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8.1 INTRODUCTION 8.2 CONCEPT AND ORIGIN OF HYPERCONJUGATION 8.2.1 σ–π and σ–p Conjugation 8.2.2 Hyperconjugation in Carbocations 8.2.3 Hyperconjugation in Alkenes 8.2.4 Hyperconjugation and Alkene Stability 8.2.5 Hyperconjugation and Aromatic Systems 8.3 RELATIONSHIP BETWEEN HYPERCONJUGATION AND MOLECULAR STABILITY 8.4 DEFINITION AND MECHANISM OF THE INDUCTIVE EFFECT 8.4.1 +I and −I Effects 8.4.2 Electron-Withdrawing Groups 8.4.3 Electron-Releasing Groups 8.4.4 Distance Dependence of Inductive Effects 8.5 INDUCTIVE EFFECT AND ACIDITY 8.5.1 Inductive Effect and Basicity 8.5.2 Inductive Effect in Carbocation Stability 8.5.3 Inductive Effect in Carbanion Stability 8.6 COMBINED IMPORTANCE OF HYPERCONJUGATION AND INDUCTIVE EFFECT 8.6.1 Important Comparative Examples 8.6.2 Significance of Hyperconjugation and Inductive Effect |
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Ch.09 |
ELECTROMERIC EFFECT AND RELATIONSHIP BETWEEN ELECTRONIC EFFECTS AND REACTIVITY |
182-221 |
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9.1 INTRODUCTION 9.2 DEFINITION AND CHARACTERISTICS OF THE ELECTROMERIC EFFECT 9.2.1 Characteristics of the Electromeric Effect 9.2.2 +E and −E Effects 9.2.3 Temporary Polarization 9.2.4 Electromeric Effect in Carbonyl Compounds 9.3 ELECTROMERIC EFFECT IN ALKENES 9.3.1 Comparison of Electromeric, Inductive, and Resonance Effects 9.4 ELECTRONIC FACTORS CONTROLLING ORGANIC REACTIONS 9.4.1 Stability of Charged Species 9.4.2 Effect of Substituents on Reactivity 9.4.3 Structure–Reactivity Relationships 9.5 APPLICATION OF ELECTRONIC EFFECTS IN PREDICTING REACTION OUTCOMES 9.6 ELECTRONIC EFFECTS AND REACTION MECHANISMS 9.7 ELECTRONIC EFFECTS AND REGIOSELECTIVITY 9.8 PRACTICAL STRATEGY FOR PREDICTING ORGANIC REACTION OUTCOMES |
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Ch.10 |
EMERGING PERSPECTIVES IN MODERN CHEMISTRY |
222-259 |
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10.1 INTRODUCTION 10.2 COMPUTATIONAL CHEMISTRY 10.2.1 Meaning and Scope of Computational Chemistry 10.2.2 Historical Development of Computational Chemistry 10.2.3 Why Computational Chemistry Is Important 10.2.4 Molecular Modelling 10.2.5 Quantum Chemistry 10.2.6 Major Computational Methods 10.3 ARTIFICIAL INTELLIGENCE AND CHEMISTRY 10.3.1 Machine Learning 10.3.2 Types of Machine Learning Relevant to Chemistry 10.3.3 Representation of Molecules for AI 10.3.4 AI in Drug Discovery 10.3.5 AI-Assisted Reaction Prediction 10.3.6 AI in Materials Chemistry 10.3.7 AI and Laboratory Automation 10.3.8 Generative AI in Chemistry 10.3.9 Limitations and Challenges 10.4 GREEN AND SUSTAINABLE CHEMISTRY 10.4.1 The Twelve Principles of Green Chemistry 10.4.2 Green Chemistry versus Conventional Chemistry 10.4.3 Bio-Based and Biodegradable Materials 10.4.4 Sustainable Chemistry 10.4.5 Green Metrics 10.4.6 Relationship between Green Chemistry and Sustainable Development 10.5 ILLUSTRATIVE INTEGRATED EXAMPLES |
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Prof. Aashish A. Gadgil
Prof. Aashish A. Gadgil is working as Assistant Professor at KLS Gogte Institute of Technology, Belagavi. He has authored many papers in Scopus indexed journals of high repute. He is the author of many Internationally recognized books and has also contributed book chapters in international books. He is currently pursuing research in the field of Biomedical Engineering and AI and Machine Learning.
Dr. Sarika Chhabria Talreja
Dr. Sarika Chhabria Talreja, M.Sc. [Organic Chemistry], UGC SET [Chemical Sciences], Ph.D. [Chemistry] is working as a Professor in the Department of Chemistry, CHM College, Thane affiliated to the University of Mumbai. She received her Bachelor’s Degree in Chemistry & Master’s Degree in Organic Chemistry, both with distinction. She is the proud recipient of two prestigious Gold Medals for top-ranking the Post-graduate Course in Chemistry. She completed her Doctoral work from Guru Nanak Khalsa College, Mumbai. The author has over 21 years of teaching experience & 12 years of research experience. The author is an active Life member of Council of Education Administration & Management (CEAM), Association of Chemistry Teachers (ACT), Bose Science Society [BSS] and Fellow Member of Indian Academic Researchers Association [IARA]. She has been on the Advisory Board & also invited as Chairperson for paper presentations as well as Resource Person in Webinars, Conferences & Faculty Development Program. She has been bestowed with the prestigious Best Women Scientist Award, Bhushan National Award, Kranti Surya Mahatma Phule National Award, Bharat Shiksha Samman Award, Suvarna Pratibha Ratna National Award.
Dr. Anjali Krishna G.
Dr. Anjali Krishna G. native is Ernakulam, Kerala, completed phd from Cochin University of Science and Technology (CUSAT), Kochi in 2023. I also did M.Phil. in chemistry from CUSAT. B.Sc. from St. Xaviers College for Women, Aluva and M.Sc. from Sacred Heart College, Thevara. I have 4 years of teaching experience in engineering and now working as an Assistant Professor in KPRIET, Coimbatore. I have published more than 20 papers in reputed journals.
