ISC Class 12 Chemistry Syllabus 2027
The ISC Class 12 Chemistry syllabus for the 2027 exam has 10 units and 21 chapters, with about 164 topics. Each chapter below links to every past question on it with answers. For how the 70-mark theory paper is laid out, see the paper pattern guide.
Marks for each unit in the syllabus
| Unit | Marks |
|---|---|
| Physical Chemistry: Solutions, Electrochemistry, Chemical Kinetics | 25 |
| Inorganic Chemistry: d- and f-Block Elements, Coordination Compounds | 14 |
| Organic Chemistry: Haloalkanes and Haloarenes, Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds containing Nitrogen, Biomolecules | 31 |
| Total | 70 |
The syllabus gives one figure to units listed together. Source: CISCE’s ISC 2027 Chemistry syllabus.
Where the marks went in the board papers since 2023
| Unit | Share of the marks |
|---|---|
| Electrochemistry | 16% |
| Alcohols, Phenols and Ethers | 13% |
| Solutions | 12% |
| Aldehydes, Ketones and Carboxylic Acids | 11% |
| Chemical Kinetics | 11% |
| Coordination Compounds | 10% |
| d-and f-Block Elements | 8% |
| Organic Compounds containing Nitrogen | 8% |
| Haloalkanes and Haloarenes | 6% |
| Biomolecules | 4% |
Counted from the 4 Chemistry board papers of 2023 to 2026 on Prashnika: each question’s marks as printed. Where a question offers an either-or choice, both options are counted, so read the shares as a guide to emphasis, not as exact marks.
Solutions
- All 92 questions on Solutions
Solubility of gases in liquids, Henry's Law, Raoult's Law, Azeotropic mixtures, Colligative properties, Relative lowering of vapour pressure, Depression in freezing point, Elevation in boiling point, Osmotic pressure, Reverse osmosis, Abnormal molecular mass, van't Hoff factor
Electrochemistry
- All 87 questions on Electrochemistry
Electrochemical cells, Galvanic cells, Measurement of potential, Standard hydrogen electrode, Standard electrode potential, Cell notation, Electrochemical series, Nernst equation, Metallic conductance and electrolytic conductance, Cell constant, Kohlrausch's Law, Faraday's laws of Electrolysis, Batteries, Corrosion
Chemical Kinetics
- All 88 questions on Chemical Kinetics
Rate of Reaction, Law of mass Action, Effect of concentration of reactants on the rate of a reaction, Order of a reaction, Half-life period, Molecularity of the reaction, The concept of energy, Collision Theory, Mechanism of the reaction, Effect of temperature on the rate constant of a reaction, Arrhenius equation
d-and f-Block Elements
- All 90 questions on d-and f-Block Elements
d-Block, f-Block, Lanthanoid contraction, Actinoids, Potassium permanganate, Potassium dichromate
Coordination Compounds
- All 81 questions on Coordination Compounds
Definition of coordination compounds, Ligands, Coordination number, Oxidation state, IUPAC rules of nomenclature, Isomerism, Valence bond theory, Crystal field theory, Stability of coordination compounds, Importance and uses
Haloalkanes and Haloarenes
- All 73 questions on Haloalkanes and Haloarenes
Haloalkanes, Nature of C-X bond, Preparation of haloalkanes, Physical properties, Chemical properties, Nucleophilic substitution reactions, Elimination reaction, Saytzeff's rule, Reaction with metals, Chloroform and iodoform, Freons, Preparation of haloarenes, Electrophilic substitution, Nucleophilic substitution, Reduction to benzene, Wurtz-Fittig reaction, Fittig reaction, DDT
Alcohols, Phenols and Ethers
- Alcohols 53 questions
Classification into monohydric, dihydric and polyhydric alcohols, Methods of preparation, Acidic nature of alcohols, Esterification, Dehydration, Uses of alcohols, Conversion of one alcohol into another, Lucas' Test - Phenols 46 questions
Classification and nomenclature, Methods of preparation, Acidic character of phenol, Electrophilic substitution reactions, Kolbe's reaction, Reimer-Tiemann reaction, Test for phenol, Uses of phenols - Aliphatic Ethers 12 questions
General formula, structure and nomenclature, Preparation from alcohol, Physical properties, Chemical properties, Uses - Aryl ethers 1 questions
Physical properties, Preparation of anisole, Electrophilic substitution, Uses of ether
Aldehydes, Ketones and Carboxylic Acids
- Aldehydes and Ketones 76 questions
Preparation, Physical properties, Nucleophilic addition reactions, Oxidation reactions, Iodoform reaction, Reduction, Aldol condensation, Cannizzaro's reaction, Tests, Uses of aldehydes and ketones - Aromatic aldehyde (Benzaldehyde) 7 questions
Lab preparation, Physical properties, Oxidation and reduction, Nucleophilic addition reaction, Cannizzaro reaction, Benzoin condensation, Perkin's reaction, Electrophilic substitution, Test, Uses of benzaldehyde - Carboxylic Acids 9 questions
Classification, Preparation, Physical properties, Acidic character, Formation of acid derivatives, Decarboxylation, HVZ reactions, Substitution of benzene ring, Tests for acids, Uses
Organic Compounds containing Nitrogen
- Aliphatic Amines 45 questions
Classification of amines, Methods of preparation, Gabriel phthalimide Synthesis, Physical properties, Basic character of amines, Carbylamine reaction, Hinsberg's Test - Aniline 11 questions
Preparation, Physical properties, Acetylation, alkylation, Benzoylation, Diazotisation, Electrophilic substitution, Tests for aniline, Uses of aniline - Cyanides and Isocyanides 9 questions
Cyanides methods of preparation, Isocyanides methods of preparation - Diazonium salts 21 questions
Preparation from aniline, Properties, Sandmeyer's reaction, Gattermann reaction, Balz Scheimann reaction, Coupling reaction
Biomolecules
- Carbohydrates 19 questions
Definition and classification, Structures for glucose and fructose, Test for glucose and fructose, Disaccharides, Polysaccharides - Proteins 22 questions
Amino acids, Isoelectric point, Structure of proteins, Denaturation of proteins - Vitamins 12 questions
Classification and functions, Deficiency diseases - Nucleic Acids 6 questions
Basic unit purine and pyrimidine, DNA structure, RNA, Differences between DNA and RNA
The practical and project marks
The practical component is 30 marks: the practical examination carries 15, the project work 10 and the practical file 5.
Common questions
How many units and chapters are in the ISC Class 12 Chemistry syllabus?
The 2027 syllabus lists 10 units: Solutions, Electrochemistry, Chemical Kinetics, d-and f-Block Elements, Coordination Compounds, Haloalkanes and Haloarenes, Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds containing Nitrogen, Biomolecules. They hold 21 chapters.
How many marks does each unit of ISC Class 12 Chemistry carry?
Physical Chemistry: Solutions, Electrochemistry, Chemical Kinetics: 25; Inorganic Chemistry: d- and f-Block Elements, Coordination Compounds: 14; Organic Chemistry: Haloalkanes and Haloarenes, Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Organic Compounds containing Nitrogen, Biomolecules: 31. The theory paper is 70 marks.
Which Chemistry chapters were in earlier ISC papers but not in the 2027 syllabus?
Solid State, Surface Chemistry, General Principles and Processes of Isolation of Elements, Group-15 Elements, Group-16 Elements, Group-17 Elements, Group-18 Elements, Chemistry in Everyday Life, Polymers. Older papers on Prashnika still have questions on them, marked by chapter, which are useful only if your syllabus still has the chapter.
Keep reading
Units, chapters and topics from CISCE’s ISC 2027 syllabus. Last checked 2026-10-16.