GATE Chemistry Syllabus 2027: CY Topic-wise Guide

The GATE Chemistry syllabus 2027 is the official list of topics for the CY paper of GATE 2027, organised this cycle by IIT Madras. It is split into three sections, Physical, Inorganic and Organic Chemistry, plus a General Aptitude syllabus common to all GATE papers. Chemistry carries 85 of the 100 marks, so the subject syllabus deserves most of your planning time.

This page turns the official 2027 PDF into a usable checklist: every unit, the key sub-topics inside it, where to start and how to plan your coverage. It also explains what changed from the GATE 2026 CY syllabus, because many study plans and topic lists online still follow the older version. IIT Madras does not publish topic-wise weightage, so treat any percentage split you see as an estimate, not an official figure.

Table of Contents

GATE Chemistry Syllabus at a Glance

The split of the 85 chemistry marks between the three sections is not fixed by the brochure. In practice, all three sections appear in every paper, so skipping a whole section is risky.

Key Changes to Know in the 2027 Syllabus

The GATE 2027 website states that the syllabi of the test papers have been revised. Comparing the 2027 CY PDF with the 2026 CY syllabus shows these differences.

• No separate Radioactivity unit: The 2026 Inorganic section had a Radioactivity unit (decay, half-life, fission and fusion). The 2027 PDF does not list it as a unit.

• Organic section reorganised: The 2027 list has separate units for General Concepts, Types of Reactions, Oxidation and Reduction, with named reagents and reactions written out in more detail.

• Physical section split into smaller units: Quantum chemistry now appears as Structure, Particle in a Box, Harmonic Oscillator, Rotational Motion and Hydrogen-like Atoms, while Solutions, Electrochemistry and Phase Equilibria are separate units.

• Instrumental methods listed in detail: The Inorganic section names techniques such as ESR, Mössbauer (Fe and Sn), AAS, cyclic voltammetry and thermal methods.

Older pages may still show the 2026 list, including radiochemistry, so follow the official 2027 PDF. Official GATE 2027 test papers and syllabus page: https://gate2027.iitm.ac.in/exam_papers_and_syllabus

Physical Chemistry Syllabus

Physical chemistry is the most numerical part of GATE CY. Many NAT questions come from here, so you need both concepts and calculation speed with the virtual calculator.

Quantum chemistry and structure

Start with particle in a box and the hydrogen atom. They give you the standard results, such as the box energy $E_n = \frac{n^2 h^2}{8 m L^2}$, that many other questions build on.

Group theory and spectroscopy

• Group theory: Symmetry elements and operations, point groups, multiplication tables, classes, reducible and irreducible representations, selection rules, internal coordinates and symmetry-adapted linear combinations.

• Spectroscopy: Russell-Saunders coupling and term symbols, rotational, vibrational, electronic and Raman spectra, line broadening with Gaussian and Lorentzian shapes, Beer-Lambert law, Einstein coefficients, Jablonski diagram, oscillator strength, and basic NMR (gyromagnetic ratio, chemical shift, spin-spin coupling).

Thermodynamics, solutions and electrochemistry

The Nernst equation, $E = E^\circ - \frac{RT}{nF}\ln Q$, connects electrochemistry with thermodynamics through $\Delta G = -nFE$. Learning these links once saves revision time later.

Kinetics and surfaces

• Kinetics and Reaction Dynamics: Elementary, parallel, opposing and consecutive reactions, steady-state approximation, unimolecular reactions, potential energy surfaces and trajectories, transition state theory and the Eyring equation, enzyme catalysis, kinetic isotope effects, fast reactions by relaxation and flow methods, diffusion-controlled reactions, quantum yield, and static and dynamic quenching.

• Surfaces and Interfaces: Physisorption and chemisorption, Langmuir, Freundlich and BET isotherms, surface catalysis including the Langmuir-Hinshelwood mechanism, surface tension, viscosity, self-assembly, colloids, micelles and macromolecules.

Inorganic Chemistry Syllabus

Inorganic chemistry mixes reasoning topics, such as crystal field theory, with descriptive facts about structures and industrial processes. The reasoning topics usually take longer to learn but are easier to score in.

Bragg's law, $n\lambda = 2d\sin\theta$, and the cubic spacing formula are common starting points for NAT questions in solid-state chemistry.

Organic Chemistry Syllabus

The 2027 Organic section lists named reagents and reactions in detail. That makes it easier to build a complete checklist, but it also means the section is long. Work through it in the order below.

Concepts, stereochemistry and mechanisms

• General Concepts: Structure-property relationships, acidity and basicity, aromaticity and stability.

• Stereochemistry: Chirality, absolute configuration, optical purity and enantiomeric excess, topicity (homotopic, enantiotopic and diastereotopic groups), conformational analysis, atropisomerism and neighbouring group participation.

• Reaction Mechanisms: Energy profiles, Hammond postulate, Curtin-Hammett principle, kinetic versus thermodynamic control, isotopic labelling, solvent effects, and the Hammett and Taft equations.

• Types of Reactions: SN1, SN2 and SNAr, electrophilic aromatic substitution, addition and elimination, carbocations, carbanions, carbenes, nitrenes, arynes and radicals, rearrangements, and radical reactions such as Barton decarboxylation, Barton-McCombie and Hunsdiecker.

Synthesis, oxidation and reduction

Pericyclic reactions, heterocycles, biomolecules and techniques

• Pericyclic Reactions and Photochemistry: Electrocyclic, cycloaddition and sigmatropic reactions including Diels-Alder, Claisen and Cope, FMO theory and Woodward-Hoffmann rules, and photochemical reactions such as di-pi-methane, Norrish type I and II, Paterno-Buchi, photo-Curtius, Wolff, Barton and Hofmann-Loffler-Freytag.

• Heterocyclic Compounds: Nomenclature, structure, synthesis and reactivity of furan, pyrrole, thiophene, pyridine, indole, quinoline and isoquinoline.

• Biomolecules: Monosaccharides and disaccharides, amino acids and peptide synthesis, protein structure, nucleic acids, lipids, steroids, terpenoids, carotenoids and alkaloids.

• Experimental Techniques: Polarimetry, TLC, column chromatography, HPLC and GC, and structure determination using UV-visible, IR, NMR and mass spectrometry.

General Aptitude Syllabus

General Aptitude carries 15 marks and is the same for every GATE paper. The questions are school-level in content but need speed and careful reading.

Linked Topics Across Sections

Several units appear in more than one section under different names. Studying them together cuts revision time.

How to Cover the GATE Chemistry Syllabus

A phased plan keeps all three sections moving. Adjust the weeks to your starting level and the time left before February 2027.

1. Weeks 1 to 6, foundations: Thermodynamics, kinetics and electrochemistry in Physical; main group and coordination chemistry in Inorganic; stereochemistry and mechanisms in Organic. Start a formula sheet and a named-reaction table.

2. Weeks 7 to 12, advanced units: Quantum chemistry, group theory and spectroscopy; organometallics, solids and instrumental methods; synthesis, oxidation, reduction and pericyclic reactions. Add 20 to 30 minutes of General Aptitude three times a week.

3. Weeks 13 to 16, remaining units and topic tests: Statistical thermodynamics, surfaces, bioinorganic chemistry, heterocycles and biomolecules. Take topic-wise tests after each unit.

4. Final phase, papers and mocks: Solve previous CY papers under time, then move to full-length mocks with same-day analysis and error-log revision.