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JEE Main Chemistry Important Chapters

Last updated date: 05th Dec 2023
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Achieving a 99 %ile in JEE Mains Chemistry: A Guide to the Key Topics and Chapterwise Weightage

Chemistry is the rank decider for most students in any engineering entrance examination because it mostly talks about the basics and, in comparison to Mathematics and Physics questions asked in JEE, Chemistry questions are more theoretical than calculative, making it relatively easier for students to score well from this section. The best way to prepare for the JEE Chemistry subject is to go over previous years' question papers and enhance all topics accordingly.

The important chapters in JEE Main Chemistry play a crucial role in determining a candidate's overall score and rank. Understanding and mastering these topics is essential to perform well in the chemistry section of the exam. Students aspiring to excel in JEE Main must prioritise these important chapters and dedicate sufficient time and effort to grasp the underlying concepts and solve related problems effectively. In this article, we will explore the key JEE Main Chemistry chapters that deserve special attention to boost chances of success in this highly competitive examination.

JEE Main Chemistry Important Chapters That Will Make or Break Your JEE Main Score

To achieve a high score, it's essential to concentrate on specific important chapters that have historically carried significant weightage in the exam. In this guide, we have categorised these crucial topics into easy and difficult segments based on the level of questions asked in previous years' JEE Main papers. Here is the list of most important Chemistry chapters for JEE Main 2024:

  • Organic Compounds Containing Oxygen

  • Equilibrium

  • Chemical Kinetics

  • Transition Elements (D And F Block)

  • Chemical Bonding And Molecular Structure

  • Some Basic Principles Of Organic Chemistry

  • Coordination Compounds

  • Chemical Thermodynamics

By focusing on these chapters, you can aim to score more than 60 marks in the Chemistry paper. Let's dive into the details!

The Chemistry Chapters That You Can't Afford to Ignore for JEE Main

Mastering the Chemistry section of the Joint Entrance Examination (JEE) Main can be challenging, especially when dealing with certain intricate topics. These areas demand extensive practice and dedicated preparation to excel. The exam questions are often of a high level, involving numerical complexities and the amalgamation of 2-3 concepts. Below, we outline these demanding topics that necessitate special attention:

Most Important Chapters of Chemistry JEE Main 2024

Organic Compounds Containing Oxygen

General methods of preparation, properties, reactions, and uses.


Alcohols: Identification of primary, secondary, and tertiary alcohols: mechanism of dehydration.

Phenols: Acidic nature, electrophilic substitution reactions: halogenation. nitration and sulphonation. Reimer - Tiemann reaction.

Ethers: Structure.

Aldehyde and Ketones: Nature of carbonyl group; Nucleophilic addition to >C=O group, relative reactivities of aldehydes and ketones; Important reactions such as - Nucleophilic addition reactions (addition of HCN. NH3, and its derivatives), Grignard reagent; oxidation: reduction (Wolf Kishner and Clemmensen); the acidity of -hydrogen. aldol condensation, Cannizzaro reaction. Haloform reaction, Chemical tests to distinguish between aldehydes and Ketones.

Carboxylic Acids

Acidic strength and factors affecting it,


Meaning of equilibrium, the concept of dynamic equilibrium.

Equilibria involving physical processes: Solid-liquid, liquid - gas and solid-gas equilibria, Henry's law. General characteristics of equilibrium involving physical processes.

Equilibrium involving chemical processes: Law of chemical equilibrium, equilibrium constants (Kp and Kc) and their significance, the significance of G and G in chemical equilibrium, factors affecting equilibrium concentration, pressure, temperature, the effect of catalyst; Le Chatelier’s principle.

Ionic equilibrium: Weak and strong electrolytes, ionization of electrolytes, various concepts of acids and bases (Arrhenius. Bronsted - Lowry and Lewis) and their ionization, acid-base equilibria (including multistage ionization) and ionization constants, ionization of water. pH scale, common ion effect, hydrolysis of salts and pH of their solutions, the solubility of sparingly soluble salts and solubility products, buffer solutions.

Chemical Kinetics

Rate of a chemical reaction, factors affecting the rate of reactions: concentration, temperature, pressure, and catalyst; elementary and complex reactions, order and molecularity of reactions, rate law, rate constant and its units, differential and integral forms of zero and first-order reactions, their characteristics and half-lives, the effect of temperature on the rate of reactions, Arrhenius theory, activation energy and its calculation, collision theory of bimolecular gaseous reactions (no derivation).

Transition Elements (D and F Block)

Transition Elements

General introduction, electronic configuration, occurrence and characteristics, general trends in properties of the first-row transition elements - physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic behaviour, magnetic properties, complex formation, interstitial compounds, alloy formation; Preparation, properties, and uses of K2Cr2O7, and KMnO4.

Inner Transition Elements

Lanthanoids - Electronic configuration, oxidation states, and lanthanoid contraction.

Actinoids - Electronic configuration and oxidation states.

Chemical Bonding and Molecular Structure

Kossel - Lewis approach to chemical bond formation, the concept of ionic and covalent bonds.

Ionic Bonding: Formation of ionic bonds, factors affecting the formation of ionic bonds; calculation of lattice enthalpy.

Covalent Bonding: Concept of electronegativity. Fajan’s rule, dipole moment: Valence Shell Electron Pair Repulsion (VSEPR ) theory and shapes of simple molecules.

Quantum mechanical approach to covalent bonding: Valence bond theory - its important features, the concept of hybridization involving s, p, and d orbitals; Resonance.

Molecular Orbital Theory - Its important features. LCAOs, types of molecular orbitals (bonding, antibonding), sigma and pi-bonds, molecular orbital electronic configurations of homonuclear diatomic molecules, the concept of bond order, bond length, and bond energy.

Elementary idea of metallic bonding. Hydrogen bonding and its applications.

Some Basic Principles of Organic Chemistry

Tetravalency of carbon: Shapes of simple molecules - hybridization (s and p): Classification of organic compounds based on functional groups: and those containing halogens, oxygen, nitrogen, and sulphur; Homologous series: Isomerism - structural and stereoisomerism.

Nomenclature (Trivial and IUPAC)

Covalent bond fission - Homolytic and heterolytic: free radicals, carbocations, and carbanions; stability of carbocations and free radicals, electrophiles, and nucleophiles.

Electronic displacement in a covalent bond

- Inductive effect, electromeric effect, resonance, and hyperconjugation.

Common types of organic reactions- Substitution, addition, elimination, and rearrangement.

Coordination Compounds

Introduction to coordination compounds. Werner's theory; ligands, coordination number, denticity. chelation; IUPAC nomenclature of mononuclear co-ordination compounds, isomerism; Bonding-Valence bond approach and basic ideas of Crystal field theory, colour and magnetic properties; Importance of co-ordination compounds (in qualitative analysis, extraction of metals and in biological systems).

Chemical Thermodynamics

Fundamentals of thermodynamics: System and surroundings, extensive and intensive properties, state functions, types of processes.

The first law of thermodynamics - Concept of work, heat internal energy and enthalpy, heat capacity, molar heat capacity; Hess’s law of constant heat summation; Enthalpies of bond dissociation, combustion, formation, atomization, sublimation, phase transition, hydration, ionization, and solution.

The second law of thermodynamics - Spontaneity of processes; S of the universe and G of the system as criteria for spontaneity. G (Standard Gibbs energy change) and equilibrium constant.

Easy Chapters of Chemistry in JEE Main: Get High Marks with Less Effort

Preparing strategically for the Joint Entrance Examination (JEE) Main Chemistry section is essential for success. To optimise your performance, it's wise to focus on topics that offer a higher probability of scoring well which is mentioned above. In this section, we present the easy-scoring topics in the JEE Main Chemistry paper. These topics are known for their relatively easier questions and require minimal time and calculations to arrive at the correct answers.

Easy Scoring Chapters of Chemistry JEE Main 2024

Some basic concepts in chemistry

Empirical Formula And Molecular Formula, Mole concept and molar mass, Stoichiometry, Stoichiometric Calculations And Limiting Reagent, Reactions in Solutions

States of matter

The Gas Laws- Boyle’s Law (Pressure - Volume Relationship), Intermolecular Forces, Ideal Gas Equation, Dalton’s Law of Partial Pressure, Graham’s Law of Diffusion

Atomic Structure

Photoelectric effect, Line spectrum of hydrogen, Radius, velocity and the energy of nth Bohr orbital, Debroglie wavelength, Heisenberg’s uncertainty principle

Chemical Thermodynamics

Path, State Function, Types Of Process

Reversible, Irreversible, Polytropic Process

First Law Or Law Of Conservation Of Energy, Isothermal Reversible And Isothermal Irreversible, Adiabatic Reversible And Irreversible Expansion

Redox Reaction and Electrochemistry

Balancing of Redox Reactions, Oxidation, Number and Oxidation State, Types of Redox Reactions, Balancing of Redox Reaction: Ion Electrode Method, Balancing of Disproportionation Redox Reaction: Ion Electrode Method

General Principle and process of Isolation of metals

Froth Floatation Process, Leaching: Chemical Method, Conversion of ore into oxide - Calcination and Roasting,Electrolytic Refining, Vapour Phase Refining

S - Block Elements (Alkali and Alkaline Earth Metals)

Chemical Properties of Alkali Metals - 1, Chemical Properties of Alkali Metals - 2, Anomalous Behaviour of Lithium, Halides of Alkali Metals, Sodium Chloride and Sodium Hydroxide

d - and f - Block Elements

Screening Effect and Lanthanoid Contraction, Atomic Size/Radii, Ionisation Energy, Oxidation State, Magnetic Properties and Character

Co-ordination Compounds

Addition Compounds or Molecular Compounds, Terminologies Related to Coordination Compounds,Types of Ligands - 1

Oxidation Number, Coordination Number

Purification and Characterisation of Organic Compounds

Sublimation and Crystallisation, Distillation under reduced pressure and Steam distillation, Chromatography, Test for Halogens, Duma's Method

Some Basic Principles of Organic Chemistry

Functional Group, IUPAC Nomenclature - 1, Carbocations, Carbanions, Alkyl Free Radicals

Organic Compounds containing Halogens

Nature of C-X bond and Physical Properties, Reaction with PCl5, PCl3, SOCl2 and HX, Strong and Weak bases, SN2 Reaction, SN1 Reaction

Organic Compounds containing Oxygen

Grignard Reagent - 1, Reduction by LiAlH4 and NaBH4, Acylation and Oxidation of Alcohols, Reaction of Phenols with dil. HNO3, Preparation of Aldehydes

Chemistry in Everyday Life

Analgesics, Antibiotics, Preservatives

Principles Related to Practical Chemistry

Preliminary Test with Dilute Sulphuric Acid (Systematic Analysis of Anions): Analysis of Cations

Chemical Bonding and Molecular Structure

Lewis Representation of Simple Molecules (Lewis Structure), Limitations of The Octet Rule, Bond Parameters: length, angle, energy, strength, Fazan’s Rule and Covalent Character in Ionic Bond, p-p and p-d bonding

Classification of Elements and Periodic table

Long form of Modern periodic table, Classification of Elements : s-block, Atomic Radius of Elements, Variation of Atomic Radii and ionic radii, Ionisation Enthalpy or Ionisation Potential

Weightage Analysis of Chemistry Chapters in JEE Main Examination

Please be aware that the following topics have been listed based on their JEE Main marks-wise weightage, using data from the previous five years. Additionally, each question in the exam carries a weight of 4 marks.



Weightage (in %)

Transition Elements & Coordination Compounds



Periodic table, s and p-Block Elements



Thermodynamics & the Gaseous State



Atomic Structure



Chemical Bonding



Chemical and Ionic Equilibrium 



Solid-State and Surface Chemistry



Nuclear & Environmental Chemistry



Mole Concept 



Redox Reactions






Chemical Kinetics



Solution & Colligative Properties



General Organic Chemistry









Alkyl Halides



Carboxylic Acids & Their Derivatives



Carbohydrates, Amino Acids, and Polymers



Aromatic Compounds 



Tips And Strategies For Preparing JEE Mains Chemistry Important Chapters  

Preparing for JEE Main Chemistry and focusing on important chapters requires a strategic and disciplined approach. Here are some effective tips and strategies to help you excel in the Chemistry section:

  • Understand the Syllabus: Familiarise yourself with the JEE Main Chemistry syllabus and identify the important chapters with higher weightage.

  • Prioritise Important Chapters: Focus on the key chapters with significant weightage and dedicate more time to thoroughly understand their concepts.

  • Conceptual Clarity: Build a strong foundation by understanding the fundamental concepts of each chapter. Clear your doubts immediately and seek help from teachers or online resources if needed.

  • Practice Regularly: Practise solving a variety of problems from each important chapter to strengthen your problem-solving skills and gain confidence.

  • Refer to NCERT: NCERT textbooks are essential for JEE Main preparation. Read them thoroughly, as many questions are directly asked from NCERT in the Chemistry section.

  • Use Quality Study Material: Supplement your preparation with reference books and study materials specifically designed for JEE Main Chemistry.

  • Solve Previous Year Papers: Practice with previous year question papers to understand the exam pattern, question types, and difficulty level. This will help you identify recurring topics and areas to focus on.

  • Take Mock Tests: Regularly take full-length mock tests to simulate the exam environment and improve time management skills.

  • Analyse Performance: After each mock test, analyze your performance, identify weak areas, and work on improving them.

  • Revision: Regularly revise important chapters to ensure you retain the concepts and formulae effectively.

  • Focus on Numericals: Chemistry in JEE Main often involves numerical problems. Practice solving numerical questions from important chapters to enhance your problem-solving abilities.

  • Stay Consistent and Positive: Be consistent in your efforts and maintain a positive attitude throughout your preparation.


Focusing on JEE Main Chemistry important chapters is a strategic approach to excel in the examination. These chapters carry significant weightage and are frequently asked in the paper. By dedicating ample time and effort to understand the concepts and practice problems from these chapters, students can enhance their overall performance and increase their chances of obtaining a competitive rank. However, it is important to remember that a well-rounded preparation covering the entire syllabus is essential for success. Balancing thorough study of the important chapters with equal attention to other topics will ensure a comprehensive and effective preparation strategy for the JEE Main Chemistry section.

FAQs on JEE Main Chemistry Important Chapters

1. Which are the important chapters in JEE Main Chemistry?

Some important chapters in JEE Main Chemistry are Chemical Bonding and Molecular Structure, Chemical Kinetics, Coordination Compounds, Electrochemistry, Equilibrium, Organic Chemistry - Some Basic Principles and Techniques, p-Block Elements (Group 15, 16, 17, and 18), Solutions, Thermodynamics, Biomolecules, Alcohols, Phenols, and Ethers, Aldehydes, Ketones, and Carboxylic Acids, and Amines.

2. Why few chapters are considered important in JEE Main Chemistry?

Few chapters are considered important because they carry significant weightage in the JEE Main Chemistry paper and are frequently asked in the examination. Mastering these chapters can help students secure a competitive rank.

3. How should I prioritise studying the important chapters in JEE Main Chemistry?

While studying the important chapters, allocate more time to thoroughly understand their concepts and solve practice problems. However, do not neglect other chapters as a comprehensive preparation is crucial for the examination.

4. Are the important chapters the only ones I should study for JEE Main Chemistry?

No, while focusing on the important chapters is essential, it is equally important to cover the entire JEE Main Chemistry syllabus for a well-rounded preparation.

5. Can I score well in JEE Main Chemistry by mastering only the important chapters?

Scoring well in JEE Main Chemistry requires a balanced preparation across all chapters. While important chapters can boost your score, neglecting other topics may hinder overall performance.

6. Where can I find resources to study the important chapters in JEE Main Chemistry?

You can find study materials, video lectures, practice questions, and mock tests for the important chapters on various online platforms, coaching institutes, and educational websites.