JEE Main Chemistry Syllabus 2026 : Weightage & Deleted Topics

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SOME BASIC CONCEPTS IN CHEMISTRY

Matter and its nature, Dalton's atomic theory, Concept of atom, molecule, element and compound, Laws of chemical combination, Atomic and molecular masses, mole concept, molar mass, percentage composition, empirical and molecular formulae, Chemical equations and stoichiometry.

ATOMIC STRUCTURE

Nature of electromagnetic radiation, photoelectric effect, spectrum of the hydrogen atom, Bohr model of a hydrogen atom - its postulates, derivation of the relations for the energy of the electron and radii of the different orbits, limitations of Bohr's model, dual nature of matter, de Broglie's relationship, Heisenbergun certainty principle, elementary ideas of quantum mechanics, the quantum mechanical model of the atom and its important features, concept of atomic orbitals as one-electron wave functions, variation of 2 with r for 1s and 2s orbitals, various quantum numbers (principal, angular momentum and magnetic quantum numbers) and their significance, shapes of s, p and d - orbitals, electron spin and spin quantum number, rules for filling electrons in orbitals – Aufbau principle, Pauli's exclusion principle andHund'srule, electronic configuration of elements and extra stability of half-filled and completely filled orbitals.

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; calculationoflattice enthalpy. Covalent Bonding: Concept of electronegativity, Fajan’s rule, dipole moment, Valence Shell ElectronPairRepulsion (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.

CHEMICAL THERMODYNAMICS

Fundamentals of thermodynamics, laws of thermodynamics, enthalpies of different processes, Gibbs free energy, and equilibrium constant.

SOLUTIONS

Different methods for expressing the concentration of solution - molality, molarity, mole fraction, percentage (by volume and mass both), the vapour pressure of solutions and Raoult's Law- Ideal and nonideal solutions, vapour pressure - composition, plots for ideal and non- ideal solutions, Colligative properties of dilute solutions - a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure, determination of molecular mass using colligative properties, abnormal value of molar mass, van’t Hoff factor and its sig

EQUILIBRIUM

Meaning of equilibrium is the concept of dynamic equilibrium. Equilibria involving physical processes: Solid-liquid, liquid-gas, gas-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 (KpandKc) and their significance, the significance of ΔG and ΔG° 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, solubility products and buffer solutions.

REDOX REACTIONS AND ELECTROCHEMISTRY

Electronic concepts of oxidation and reduction, redox reactions, oxidation number, rules for assigning oxidation number and balancing of redox reactions. Electrolytic and metallic conduction, conductance in electrolytic solutions, molar conductivities and their variation with concentration, Kohlrausch’s law and its applications. Electrochemical cells - Electrolytic and Galvanic cells, different types of electrodes, electrode potentials including standard electrode potential, half-cell and cell reactions, emf of a Galvanic cell and its measurement, Nernst equation and its applications, relationship between cell potential and Gibbs' energy change, dry cell and lead accumulator, fuel cells. 

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 bi-molecular gaseous reactions (no derivation).

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CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

Modern periodic law, periodic trends, ionization enthalpy, and oxidation states.

p-BLOCK ELEMENTS

Group -13 to Group 18 Elements General Introduction: Electronic configuration and general trends in physical and chemical properties of elements across the periods and down the groups, unique behaviour of the first element in each group.

d- AND f-BLOCK ELEMENTS

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.

COORDINATION COMPOUNDS

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

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PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUNDS

Purification - Crystallization, sublimation, distillation, differential extraction and chromatography-principles and their applications. Qualitative analysis - Detection of nitrogen, sulphur, phosphorus and halogens. Quantitative analysis (basic principles only) - Estimation of carbon, hydrogen, nitrogen, halogens, sulphur and phosphorus. Calculations of empirical formulae and molecular formulae, numerical problems in organic quantitative analysis,

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, stabilityofcarbocations 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 

HYDROCARBONS

Classification, isomerism, IUPAC nomenclature, general methods of preparation, properties and reactions. Alkanes - Conformations: Sawhorse and Newman projections (of ethane), mechanism of halogen ation of alkanes. Alkenes - Geometrical isomerism, mechanism of electrophilic addition, addition of hydrogen, halogens, water, hydrogen halides (Markownikoffs and peroxide effect), Ozonolysis and polymerization. Alkynes - Acidic character, addition of hydrogen, halogens, water and hydrogen halides, polymerization. Aromatic hydrocarbons - Nomenclature, benzene - structure and aromaticity, mechanism of electrophilic substitution, halogenation, nitration. Friedel-Craft's alkylation and acylation, directive influence of the functional group in mono- substituted benzene.

ORGANIC COMPOUNDS CONTAINING HALOGENS

Preparation, reactions, environmental effects of halogenated compounds.

ORGANIC COMPOUNDS CONTAINING OXYGEN

General methods of preparation, properties, reactions and uses. ALCOHOLS,PHENOLS AND ETHERS 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=Ogroup, 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.

ORGANIC COMPOUNDS CONTAINING NITROGEN

Amines, diazonium salts, and their significance in organic synthesis.

BIOMOLECULES

General introduction and importance of biomolecules. CARBOHYDRATES – Classification, aldoses and ketoses, monosaccharides (glucose and fructose) and constituent monosaccharides of oligosaccharides (sucrose, lactose and maltose). PROTEINS - Elementary idea of � -amino acids, peptide bond, polypeptides, proteins: primary, secondary, tertiary and quaternary structure (qualitative idea only), denaturation of proteins, enzymes. VITAMINS – Classification and functions. NUCLEIC ACIDS – Chemical constitution of DNA and RNA, biological functions of nucleic acids. Hormones (General introduction)

PRINCIPLES RELATED TO PRACTICAL CHEMISTRY

Detection of extra elements (Nitrogen, sulphur, halogens) in organic compounds, detection of the following functional groups, hydroxyl (alcoholic and phenolic), carbonyl (aldehyde and ketones) carboxyl and amino groups in organic compounds.  The chemistry involved in the preparation of the following: Inorganic compounds, Mohr’s salt, potash alum. Organic compounds: Acetanilide, p-nitro acetanilide, aniline yellow, iodoform.  The chemistry involved in the titrimetric exercises – acids, bases and the use of indicators, oxalic-acid vs KMnO4, Mohr’s salt vs KMnO4  Chemical principles involved in the qualitative salt analysis: Cations – Pb 2+, Cu 2+, Al3+ , Fe 3+ , Zn 2+ , Ni2+ , Ca 2+ , Ba 2+ , Mg 2+ , NH4+ Anions- CO3 2− , S 2-, SO4 2− , NO3 -, NO2 -, Cl -, Br -, I - ( Insoluble salts excluded). Chemical principles involved in the following experiments: 1. Enthalpy of solution of CuSO4 2. Enthalpy of neutralization of strong acid and strong base. 3. Preparation of lyophilic and lyophobic sols. 4. Kinetic study of the reaction of iodide ions with hydrogen peroxide at room temperature.

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Some Basic Concepts in Chemistry

• Physical quantities and their measurements in Chemistry

• Precision and accuracy

• Significant figures

• S.I.Units, dimensional analysis

States of Matter

• Classification of matter into solid, liquid, and gaseous states

• Gaseous State: Measurable properties of gases: Gas laws – Boyle’s law, Charle’s law

• Graham’s law of diffusion

• Avogadro’s law

• Dalton’s law of partial pressure

• Concept of Absolute scale of temperature

• Ideal gas equation; Kinetic theory of gases (only postulates)

• Concept of average, root mean square and most probable velocities

• Real gases, deviation from Ideal behaviour, compressibility factor, and van der Waals equation.

• Liquid State: Properties of liquids – vapour pressure, viscosity and surface tension, and effect of temperature on them (qualitative treatment only).

• Solid State: Classification of solids: molecular, ionic, covalent and metallic solids, amorphous and crystalline solids (elementary idea)

• Bragg’s Law and its applications: Unit cell and lattices.

• packing in solids (fcc, bcc and hcp lattices), voids, calculations involving unit cell parameters, an imperfection in solids.

• Electrical and magnetic properties.

Atomic Structure

• Thomson and Rutherford atomic models and their limitations

Surface Chemistry

• Adsorption- Physisorption and chemisorption and their characteristics, factors affecting adsorption of gases on solids

• Freundlich and Langmuir adsorption isotherms, adsorption from solutions. 

• Catalysis – Homogeneous and heterogeneous, activity and selectivity of solid catalysts, enzyme catalysis, and its mechanism.

• Colloidal state- distinction among true solutions, colloids, and suspensions, 

• classification of colloids – lyophilic. lyophobic; multi-molecular. macromolecular and associated colloids (micelles)

• Preparation and properties of colloids – Tyndall effect

• Brownian movement, electrophoresis, dialysis, coagulation, and flocculation: 

• Emulsions and their characteristics.

General Principles And Processes of Isolation of Metals

(metallurgy)

• Modes of occurrence of elements in nature, minerals, ores 

• Steps involved in the extraction of metals – concentration, reduction (chemical and electrolytic methods), and refining with special reference to the extraction of Al.

• Cu, Zn, and Fe; Thermodynamic and electrochemical principles involved in the extraction of metals.

Hydrogen

• Position of hydrogen in periodic table, 

• Isotopes, preparation, properties and uses of hydrogen

• Physical and chemical properties of water and heavy water

• Structure, preparation, reactions, and uses of hydrogen peroxide

• Classification of hydrides – ionic, covalent, and interstitial. Hydrogen as a fuel. 

S - Block Elements

• General introduction

P - Block Elements

• Electronic configuration, and general trends in physical and chemical properties of elements.

• Anomalous properties of the first element of each group, diagonal relationships. Preparation and properties of some important compounds – sodium carbonate and sodium hydroxide and sodium hydrogen carbonate; 

• Industrial uses of lime, limestone. Plaster of Paris and cement: Biological significance of Na, K. Mg, and Ca.

• Groupwise study of the p – block elements Group -13: Preparation, properties, and uses of boron and aluminum

• Structure, properties, and uses of borax, boric acid, diborane, boron trifluoride, aluminum chloride, and alums.

• Group -14, The tendency for catenation; Structure, properties, and uses of Allotropes and oxides of carbon, silicon tetrachloride, silicates, zeolites, and silicones.

• Group -15, Properties and uses of nitrogen and phosphorus; Allotropic forms of phosphorus; Preparation, properties, structure, and uses of ammonia, nitric acid, phosphine, and phosphorus halides.

• Group -16: Preparation, properties, structures, and uses of ozone: Allotropic forms of sulfur; Preparation, properties, structures, and uses of sulphuric acid 

• Group-17: Preparation, properties, and uses of hydrochloric acid; Trends in the acidic nature of hydrogen halides; Structures of Interhalogen compounds and oxides and oxoacids of halogens.

• Group-18: Occurrence and uses of noble gases; Structures of fluorides and oxides of xenon.

Environmental Chemistry

• Environmental pollution – Atmospheric, water, and soil.

• Atmospheric pollution – Tropospheric and Stratospheric Tropospheric pollutants – Gaseous pollutants: Oxides of carbon, nitrogen, and sulfur

• Hydrocarbons their sources, harmful effects, and prevention; Greenhouse effect and Global warming

• Acid rain; Particulate pollutants: Smoke, dust, smog, fumes, mist; their sources, harmful effects, and prevention.  

• Stratospheric pollution- Formation and breakdown of ozone, depletion of the ozone layer – its mechanism and effects. 

• Water Pollution – Major pollutants such as. pathogens, organic wastes, and chemical pollutants; their harmful effects and prevention. 

• Soil pollution – Major pollutants such as; Pesticides (insecticides. herbicides and fungicides), their harmful effects, and prevention.

• Strategies to control environmental pollution

Polymers

• General introduction and classification of polymers

• General methods of polymerization, – Addition and condensation. 

• Copolymerization. Natural and synthetic, rubber and vulcanization, 

• Some important polymers with emphasis on their monomers and uses – polythene, nylon, polyester, and bakelite

Chemistry In Everyday Life

• Chemicals in Medicines – Analgesics, tranquilizers, antiseptics, disinfectants, antimicrobials, anti-fertility drugs, antibiotics, antacids, Anti-histamines.

• Chemicals in food – Preservatives, artificial sweetening agents – common examples. 

• Cleansing Agents – Soaps and detergents, cleansing action

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Marks

Transition Elements and Coordination Chemistry

3

12

Periodic Table and Representative Elements

3

12

Thermodynamics and Gaseous State

2

8

Atomic Structure

2

8

Chemical Bonding

2

8

Chemical and Ionic Equilibrium

2

8

Nuclear Chemistry and Environment

2

8

Mole Concept

1

4

Redox Reactions

1

4

Electrochemistry

1

4

Chemical Kinetics

1

4

Solutions and Colligative Properties

1

4

General Organic Chemistry

1

4

Stereochemistry

1

4

Hydrocarbons

1

4

Alkyl Halides

1

4

Carboxylic Acids and their Derivatives

1

4

Carbohydrates and Amino Acids

1

4

Aromatic Compounds

1

4

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