JEE Mains Chemistry Guide
How JEE Mains Chemistry actually works
A 3,455-question analysis of every JEE Mains shift from 2021 to 2026. 25 Chemistry questions, +4 for a right answer and −1 for a wrong one, on one clock shared with Physics and Maths. We sorted every chapter by the kind of work its questions ask for, and wrote 19 chapter playbooks, a reference sheet, what moved since 2021, and the distractor traps.
- Past-year questions
- 3,455
- Every shift
- 2021–2026
- Playbooks
- 19
- have a numeric answer
- 27%
- are calculations
- 32%
The paper you are sitting
Chemistry is one of three sections in JEE Mains Paper 1. Since 2025 each section is 20 multiple-choice and 5 numeric-answer questions, all compulsory, set on a syllabus that dropped 8 chapters. The 2021–24 papers printed ten numeric questions and asked for five, so older papers in the bank show more questions each.
- Questions
- 25
- Marks
- 100
- Clock
- 180 min
- Suggested for Chemistry
- ~50 min
20 MCQ · 5 numeric
+4 right · −1 wrong
shared by all three subjects
2 min a question
Read this before anything else
The same −1 means opposite rules for the two formats
On a multiple-choice question a blind guess is right one time in four for +4 and wrong three times for −1 each, so it is worth something on average:
- 4 options left: +0.25. A blind guess still pays on average. Never leave an MCQ blank at the end.
- 3 options left: +0.67. Rule out one option and the guess is worth two-thirds of a mark.
- 2 options left: +1.5. Down to two, a guess is worth more than a mark.
A numeric answer guessed blind: close to −1. A numeric answer has no options, so a guess is almost never right and still costs a mark. Enter one only when you have worked it out.
Three kinds of work, not three tiers
Every Chemistry chapter still on the paper sets one or two questions a paper, so ranking chapters by weight decides little. What differs is the work a question asks for. In the 7 physical chapters most questions are calculations, and they hold 55% of all the numeric answers. Everywhere else a question is answered by following a reaction or recalling a structure or fact.
Calculate
9.1
questions a paper · 7 chapters · 55% of numeric answers
Physical chemistry. Most of its questions need arithmetic, and most of the paper's numeric answers come from here.
Reactions
5.4
questions a paper · 5 chapters · 9% of numeric answers
The organic reaction chapters. A question gives a reagent or a short scheme and asks for the product, or names a reaction.
Structure and recall
10.0
questions a paper · 7 chapters · 30% of numeric answers
Naming, bonding, periodic trends, the blocks of the periodic table, complexes and biomolecules. Most questions test an exact fact, an order or a count from a list.
How the 3,455 questions break down
All 28 chapters in the bank, heaviest on the recent papers first. A rate is the chapter’s share of that window’s questions, scaled to one 25-question paper, so the early and recent columns compare even though the papers changed length. A calculation is a numeric answer or a multiple-choice question whose options are all numbers.
| Chapter | 2025–26 | 2021–24 | Questions | % calculation | Strand | What it asks |
|---|---|---|---|---|---|---|
| Organic Chemistry - Some Basic Principles and Techniques | 2.05 | 1.65 | 243 | 35% | Structure | Naming, isomers, electron effects and reactive intermediates, then purification and the detection and estimation of elements. The heaviest chapter on the recent papers, and the base for every organic chapter. |
| Coordination Compounds | 1.89 | 1.44 | 215 | 35% | Structure | Naming complexes, counting isomers, and crystal field theory with spin-only magnetic moments. Many of its numeric answers are counts from a list. |
| Hydrocarbons | 1.56 | 1.06 | 165 | 23% | Reactions | Alkanes, addition to alkenes and alkynes, ozonolysis, aromaticity and substitution on benzene. Most questions ask which carbon the new group goes to. |
| Some Basic Concepts of Chemistry | 1.50 | 1.48 | 205 | 72% | Calculate | The mole in every form: mass, gas volume, solution concentration, percentage composition and the limiting reagent. Its arithmetic runs through every other physical chapter. |
| The d- and f-Block Elements | 1.45 | 1.58 | 214 | 28% | Structure | Electronic configurations, oxidation states and magnetic moments across the series, the lanthanoid contraction, and the chemistry of dichromate and permanganate. |
| Chemical Thermodynamics | 1.39 | 0.76 | 128 | 65% | Calculate | Work of expansion, heat and the first law, Hess's law, then entropy and Gibbs energy. Signs decide most answers: who does work on whom, and which way heat flows. |
| Chemical Kinetics | 1.37 | 0.75 | 126 | 71% | Calculate | Rate laws and order, the integrated first-order law with its half-life, and the Arrhenius equation. Most questions are one formula with logarithms. |
| Amines | 1.34 | 1.09 | 160 | 19% | Reactions | Basicity, preparation, the tests that tell the classes apart, and diazonium salts with their replacement and coupling reactions. |
| Equilibrium | 1.31 | 0.82 | 131 | 60% | Calculate | Kc and Kp, Le Chatelier, then ionic equilibrium: pH, buffers, salt hydrolysis and solubility product. The ionic half carries most of the calculations. |
| Chemical Bonding and Molecular Structure | 1.28 | 1.27 | 176 | 35% | Structure | VSEPR shapes, hybridisation, bond order from molecular orbital theory, dipole moments and hydrogen bonding. Mostly structure work on given molecules. |
| Structure of Atom | 1.23 | 0.84 | 130 | 42% | Calculate | Photons, the Bohr model and the hydrogen spectrum, de Broglie and uncertainty, then quantum numbers and electron configuration. Half calculation, half counting electrons and orbitals. |
| Electrochemistry | 1.17 | 0.81 | 125 | 58% | Calculate | Cell potentials and the Nernst equation, Gibbs energy from a cell, conductance and Kohlrausch's law, and Faraday's laws. Sign conventions and units decide the answer. |
| Biomolecules | 1.15 | 0.92 | 135 | 15% | Structure | Carbohydrates, amino acids and proteins, vitamins, enzymes and nucleic acids. A recall chapter, with a few counts of peptides and stereocentres. |
| Aldehydes, Ketones and Carboxylic Acids | 1.12 | 1.22 | 165 | 10% | Reactions | Nucleophilic addition, the Grignard reagent, reductions, the tests, aldol and Cannizzaro, and acid strength. Short reaction schemes with a product to name. |
| Classification of Elements and Periodicity | 1.12 | 0.75 | 117 | 13% | Structure | Periodic trends in size, ionisation enthalpy, electron gain enthalpy and electronegativity, with their known exceptions. Short questions, decided by the exceptions. |
| The p-Block Elements | 1.09 | 1.43 | 185 | 14% | Structure | Groups thirteen to eighteen: trends, the inert pair effect, oxoacids, interhalogens and xenon compounds. Exact recall of structures and reactions. |
| Solutions | 1.09 | 0.69 | 110 | 65% | Calculate | Concentration terms, Raoult's law, and the four colligative properties with the van 't Hoff factor for electrolytes. |
| Haloalkanes and Haloarenes | 0.82 | 0.61 | 92 | 7% | Reactions | The two substitution mechanisms and when each wins, the nucleophile and its product, elimination against substitution, and the haloarenes. Mechanism facts decide most answers. |
| Alcohols, Phenols and Ethers | 0.60 | 0.79 | 102 | 13% | Reactions | Acidity of alcohols and phenols, dehydration with its carbocation shifts, the named reactions of phenol, and the cleavage of ethers by HI. |
| Organic Reaction Mechanisms | 0.27 | 0.37 | 48 | 17% | Small | Functional-group tests and mechanism questions that span the organic chapters. Small on the recent papers; its notes are worth a read once the reaction chapters are done. |
| The s-Block Elements | 0.11 | 0.83 | 88 | 9% | Left the syllabus | Left the syllabus: no longer set. |
| General Principles and Processes of Isolation of Elements | 0.05 | 0.71 | 74 | 7% | Left the syllabus | Left the syllabus: no longer set. |
| Polymers | 0.03 | 0.44 | 46 | 0% | Left the syllabus | Left the syllabus: no longer set. |
| Environmental Chemistry | 0.00 | 0.64 | 65 | 0% | Left the syllabus | Left the syllabus: no longer set. |
| Hydrogen | 0.00 | 0.63 | 64 | 6% | Left the syllabus | Left the syllabus: no longer set. |
| Surface Chemistry | 0.00 | 0.63 | 64 | 25% | Left the syllabus | Left the syllabus: no longer set. |
| Chemistry in Everyday Life | 0.00 | 0.48 | 49 | 6% | Left the syllabus | Left the syllabus: no longer set. |
| Solid State | 0.00 | 0.32 | 33 | 55% | Left the syllabus | Left the syllabus: no longer set. |
2025–26 is only two years of papers, so a small move in that column is noise. Chapter names link to the notes. The chapters that left the syllabus still show a few recent questions: those are questions on live topics, such as salt analysis, that were filed under the old chapter.
What’s inside
Strategy
Three kinds of work: calculate, follow a reaction, recall a structure or fact. Which chapters sit in each, the order to take them on the paper, and how to handle the question formats.
Playbooks
One playbook for every chapter carrying real weight on the paper: its pages, the skills in order, and the distractors it reuses.
Reference
The formulas, reagents, orders and tables the paper tests, chapter by chapter, on one page.
Trends
Physical chemistry has grown since the syllabus cut; eight chapters have left the paper. What moved since the early papers.
Traps
The distractors JEE reuses: the count from a list with one wrong item, the swapped reagent, the sign convention, and the blind numeric guess that costs a mark.
The reference sheet holds 189 entries across 19 chapters.
Want the teaching, not just the strategy?
This guide tells you what the paper asks and in what order to learn it. The notes teach each chapter: foundations, worked examples, self-checks, drills and a mastery check for every page. Every chapter still on the paper has notes; the 8 that left the syllabus do not.
All JEE Mains Chemistry notesWhere the numbers come from
Every question from the 2021–2026 shifts is in the bank, tagged by chapter and subtopic. Click any “Drill” link and you see the exact questions a claim is about.
The bank does not grade JEE questions by difficulty, so this guide sorts chapters by the kind of work their questions ask for, and shows each chapter’s weight beside it.
Data snapshot: 1 October 2026.