--- title: "Class 12 Chemistry Important Topics 2026–27: Chapter-Wise High-Weightage Topics & Questions" type: "Article" site_name: "TheSushant." publisher: "TheSushant." published_status: "publish" content_format: "markdown" author: "Sushant Kumar" published: "2026-04-16 20:11:49" modified: "2026-11-01 09:49:48" slug: "class-12-chemistry-important-topics-2026-27-chapter-wise-high-weightage-topics-questions-m5n68k" canonical: "https://thesushant.in/class-12-chemistry-important-topics-2026-27-chapter-wise-high-weightage-topics-questions-m5n68k/" excerpt: "If you analyze past 10–15 years of board papers, one pattern becomes clear: Questions change Language changes But core topics remain the same Examiners don’t create papers randomly. They pick..." reading_time: 4 word_count: 702 featured_image: "" featured_image_alt: "" categories: - "CBSE" - "Chemistry" - "Class 12th" tags: generator: "WP Markdown TS" generator_version: "1.1" language: "en-US" --- # Class 12 Chemistry Important Topics 2026–27: Chapter-Wise High-Weightage Topics & Questions ![Class 12 Chemistry Important Topics 2026–27: Chapter-Wise High-Weightage Topics & Questions](https://thesushant.in/img/og.php?id=3386&w=768&h=403) Table of Contents→ * [How to Use This List Properly](#toc-how-to-use-this-list-properly) * [1. Haloalkanes and Haloarenes](#toc-1-haloalkanes-and-haloarenes) * [Core Topics:](#toc-core-topics) * [Must-Prepare Questions:](#toc-must-prepare-questions) * [2. Alcohols, Phenols and Ethers](#toc-2-alcohols-phenols-and-ethers) * [Core Topics:](#toc-core-topics-2) * [Named Reactions:](#toc-named-reactions) * [Must-Do Concepts:](#toc-must-do-concepts) * [3. Aldehydes, Ketones and Carboxylic Acids](#toc-3-aldehydes-ketones-and-carboxylic-acids) * [Core Topics:](#toc-core-topics-3) * [Named Reactions:](#toc-named-reactions-2) * [Must-Prepare:](#toc-must-prepare) * [4. Amines](#toc-4-amines) * [Core Topics:](#toc-core-topics-4) * [Named Reactions:](#toc-named-reactions-3) * [High-Probability Questions:](#toc-high-probability-questions) * [5. Biomolecules](#toc-5-biomolecules) * [Core Topics:](#toc-core-topics-5) * [6. Solutions](#toc-6-solutions) * [Core Topics:](#toc-core-topics-6) * [Most Important:](#toc-most-important) * [7. Electrochemistry](#toc-7-electrochemistry) * [Core Topics:](#toc-core-topics-7) * [Must-Prepare:](#toc-must-prepare-2) * [8. Chemical Kinetics](#toc-8-chemical-kinetics) * [Core Topics:](#toc-core-topics-8) * [High-Weightage:](#toc-high-weightage) * [9. Coordination Compounds](#toc-9-coordination-compounds) * [Core Topics:](#toc-core-topics-9) * [Must-Prepare:](#toc-must-prepare-3) * [10. d & f Block Elements](#toc-10-d-f-block-elements) * [Core Topics:](#toc-core-topics-10) * [High-Probability:](#toc-high-probability) * [NCERT Questions Are Not Optional](#toc-ncert-questions-are-not-optional) * [PYQs Strategy](#toc-pyqs-strategy) * [Final Execution Plan](#toc-final-execution-plan) * [Step 1:](#toc-step-1) * [Step 2:](#toc-step-2) * [Step 3:](#toc-step-3) * [Step 4:](#toc-step-4) * [Step 5:](#toc-step-5) * [Final Truth](#toc-final-truth) * [Conclusion](#toc-conclusion) If you analyze past 10–15 years of board papers, one pattern becomes clear: * Questions change * Language changes * But **core topics remain the same** Examiners don’t create papers randomly. They pick from **concept-heavy, repeat-worthy areas** where difficulty can be adjusted. This guide is built on that logic: * Not guesswork * Not shortcuts * But **repeatable, exam-focused topics that matter every year** --- ## How to Use This List Properly Before jumping into topics, understand this: * This is **not a replacement for syllabus** * This is a **priority map** Use it to: * Focus revision * Strengthen scoring areas * Practice high-probability questions --- # ORGANIC CHEMISTRY (Highest Impact Section) Organic is interconnected. If you break flow, you lose marks. --- ## 1. Haloalkanes and Haloarenes ### Core Topics: * Nucleophilic substitution (SN1, SN2) * Reactions: * SOCl₂ * KCN vs AgCN * Alcoholic vs aqueous KOH * Markovnikov vs Anti-Markovnikov rule * Classification: * Benzylic * Allylic --- ### Must-Prepare Questions: * Why aryl halides are less reactive? * Reaction mechanisms (stepwise) * Named reactions: * Finkelstein * Swarts --- ## 2. Alcohols, Phenols and Ethers ### Core Topics: * Preparation methods (especially from Grignard reagent) * Dehydration mechanism * Oxidation (1°, 2°, 3° alcohols) * Acidic nature (with EWG/EDG) --- ### Named Reactions: * Reimer–Tiemann * Kolbe reaction * Williamson synthesis --- ### Must-Do Concepts: * Phenol halogenation * Reaction mechanisms --- ## 3. Aldehydes, Ketones and Carboxylic Acids ### Core Topics: * Preparation: * Ozonolysis * Hydration of alkynes * Important derivatives: * Acetal, hemiacetal * Oxime, cyanohydrin * Tests: * Tollens * Fehling * Iodoform --- ### Named Reactions: * Rosenmund * Stephen * Clemmensen * Wolff-Kishner * Gattermann --- ### Must-Prepare: * Acidic strength of benzoic acid * Reaction mechanisms --- ## 4. Amines ### Core Topics: * Basic strength (gas vs aqueous phase) * Tests: * Carbylamine * Hinsberg * Nitrous acid --- ### Named Reactions: * Hoffmann bromamide * Gabriel phthalimide * Schotten–Baumann --- ### High-Probability Questions: * Direct nitration of aniline (ortho/meta/para issue) * Order of basicity --- ## 5. Biomolecules ### Core Topics: * Carbohydrates: * Types + examples * Reducing vs non-reducing * Proteins: * Fibrous vs globular * DNA vs RNA * Alpha helix vs beta sheet --- # PHYSICAL CHEMISTRY (Numerical + Concept Mix) --- ## 6. Solutions ### Core Topics: * Concentration terms (especially molarity) * Henry’s Law (numericals) * Raoult’s Law * Ideal vs non-ideal solutions --- ### Most Important: * Colligative properties (ALL 4) * Van’t Hoff factor --- ## 7. Electrochemistry ### Core Topics: * Galvanic vs electrolytic cell * Nernst equation (numericals) * Conductivity & molar conductance * Effect of dilution --- ### Must-Prepare: * Kohlrausch law * Batteries: * Lead storage * Fuel cell --- ## 8. Chemical Kinetics ### Core Topics: * Rate law * Order vs molecularity * Zero & first order derivations * Half-life formulas --- ### High-Weightage: * Graph-based questions * Arrhenius equation * Table-based numericals (order calculation) --- # INORGANIC CHEMISTRY (Direct + NCERT-Based) --- ## 9. Coordination Compounds ### Core Topics: * Nomenclature * Isomerism: * Linkage * Ionization * Hydrate --- ### Must-Prepare: * Hybridization (VBT) * Magnetic moment * Stability (CFSE) --- ## 10. d & f Block Elements ### Core Topics: * Electronic configuration * Oxidation states * Trends: * Ionization energy * Atomic radius --- ### High-Probability: * Lanthanide contraction * Important compounds + reactions --- # MOST IMPORTANT RULE (This is where toppers win) ## NCERT Questions Are Not Optional You must complete: * In-text questions * Examples * Exercise questions These are directly used to frame board questions. --- ## PYQs Strategy Minimum: * Last 5 years Best: * Last 10 years Why: * Pattern repetition * Concept clarity * Confidence --- ## Final Execution Plan ### Step 1: Complete NCERT (line-by-line understanding) ### Step 2: Focus on these high-weightage topics ### Step 3: Solve NCERT questions ### Step 4: Solve PYQs ### Step 5: Practice full-length papers --- ## Final Truth You do not need 10 books. You need: * NCERT * Important topics (above) * PYQs Repeated properly. --- ## Conclusion Chemistry scoring is not about doing everything. It is about doing **the right things repeatedly**: * Important topics * NCERT questions * PYQs If you execute this properly, high marks are predictable. --- **Enjoyed this?** Share it with others S ### [Sushant Kumar](https://thesushant.in/author/sushant/) Founder As a current B.Com (Hons) student at DU SOL and an active Chartered Accountancy (CA) aspirant, I understand the exact pressure, syllabus confusion, and administrative hurdles students face daily. TheSushant.in was built to provide first-hand, stress-tested guidance. Every DU SOL update, exam strategy, and CA study note shared here comes directly from my personal academic journey, official notifications, and real-time student experience. No generic advice: practical, student-to-student blueprints to help you clear your exams and level up. 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