JEE Exam > JEE Notes > Chemistry Main & Advanced > Hydrocarbons: JEE Main Previous Year Questions (2021-2026)
Hydrocarbons: JEE Main Previous Year Questions (2021-2026)
| Download, print and study this document offline |
Please wait while the PDF view is loading
Page 1 JEE Main Previous Year Questions (2021-2026): Hydrocarbons (January 2026) Q1: Arrange the following alkenes in decreasing order of stability. Choose the correct answer from the options given below: A: III > I > II > IV B: III > II > I > IV C: I > III > II > IV D: I > III > IV > II Answer: C Explanation: Page 2 JEE Main Previous Year Questions (2021-2026): Hydrocarbons (January 2026) Q1: Arrange the following alkenes in decreasing order of stability. Choose the correct answer from the options given below: A: III > I > II > IV B: III > II > I > IV C: I > III > II > IV D: I > III > IV > II Answer: C Explanation: Trans is more stable than cis. Q2: But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/liq. NH 3 to give the products X and Y respectively. Identify the incorrect statements. A. X and Y are stereoisomers. B. Dipole moment of X is zero. C. Boiling point of X is higher than Y . D. X and Y react with O3/Zn+H2O to give different products. Choose the correct answer from the options given below: A: B and D Only B: A and C Only C: A and B Only D: B and C Only Answer: A Explanation: Page 3 JEE Main Previous Year Questions (2021-2026): Hydrocarbons (January 2026) Q1: Arrange the following alkenes in decreasing order of stability. Choose the correct answer from the options given below: A: III > I > II > IV B: III > II > I > IV C: I > III > II > IV D: I > III > IV > II Answer: C Explanation: Trans is more stable than cis. Q2: But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/liq. NH 3 to give the products X and Y respectively. Identify the incorrect statements. A. X and Y are stereoisomers. B. Dipole moment of X is zero. C. Boiling point of X is higher than Y . D. X and Y react with O3/Zn+H2O to give different products. Choose the correct answer from the options given below: A: B and D Only B: A and C Only C: A and B Only D: B and C Only Answer: A Explanation: Dipole moment ? 0 Q3: The ?nal product [B] is : A: Page 4 JEE Main Previous Year Questions (2021-2026): Hydrocarbons (January 2026) Q1: Arrange the following alkenes in decreasing order of stability. Choose the correct answer from the options given below: A: III > I > II > IV B: III > II > I > IV C: I > III > II > IV D: I > III > IV > II Answer: C Explanation: Trans is more stable than cis. Q2: But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/liq. NH 3 to give the products X and Y respectively. Identify the incorrect statements. A. X and Y are stereoisomers. B. Dipole moment of X is zero. C. Boiling point of X is higher than Y . D. X and Y react with O3/Zn+H2O to give different products. Choose the correct answer from the options given below: A: B and D Only B: A and C Only C: A and B Only D: B and C Only Answer: A Explanation: Dipole moment ? 0 Q3: The ?nal product [B] is : A: B: C: D: Answer: A Explanation: Q4: Consider the following reaction: Page 5 JEE Main Previous Year Questions (2021-2026): Hydrocarbons (January 2026) Q1: Arrange the following alkenes in decreasing order of stability. Choose the correct answer from the options given below: A: III > I > II > IV B: III > II > I > IV C: I > III > II > IV D: I > III > IV > II Answer: C Explanation: Trans is more stable than cis. Q2: But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/liq. NH 3 to give the products X and Y respectively. Identify the incorrect statements. A. X and Y are stereoisomers. B. Dipole moment of X is zero. C. Boiling point of X is higher than Y . D. X and Y react with O3/Zn+H2O to give different products. Choose the correct answer from the options given below: A: B and D Only B: A and C Only C: A and B Only D: B and C Only Answer: A Explanation: Dipole moment ? 0 Q3: The ?nal product [B] is : A: B: C: D: Answer: A Explanation: Q4: Consider the following reaction: The product Y formed is: A: 2-methylhex-3-yne B: 5-methylhex-2-yne C: Isopropylbut-1-yne D: 2-methylhex-2-yne Answer: A Explanation:Read More
FAQs on Hydrocarbons: JEE Main Previous Year Questions (2021-2026)
| 1. How do I identify whether a hydrocarbon is alkane, alkene, or alkyne in JEE Main questions? |  |
Ans. Alkanes contain only C-C single bonds (general formula CₙH₂ₙ₊₂), alkenes have at least one C=C double bond (CₙH₂ₙ), and alkynes contain C≡C triple bonds (CₙH₂ₙ₋₂). Check the molecular formula or structure diagram-the number of hydrogen atoms relative to carbon atoms reveals the unsaturation level. This distinction is fundamental for answering JEE previous year questions on hydrocarbon classification.
| 2. What are the most common isomerism patterns asked in JEE Main hydrocarbons questions from 2021-2026? | |
Ans. Structural isomerism (chain, position, functional group) and geometrical isomerism (cis-trans in alkenes) dominate JEE exam papers. Students frequently encounter questions requiring them to draw or identify all possible isomers of C₅H₁₀ or C₆H₁₂. Understanding branching patterns and double bond positions is essential for solving hydrocarbon previous year questions accurately.
| 3. Why do some alkenes show cis-trans isomerism while others don't in JEE chemistry? | |
Ans. Geometric isomerism occurs only when both carbons of a C=C double bond have different substituents (no symmetry). If either carbon bears identical groups, free rotation restriction doesn't create distinct isomers. This concept appears repeatedly in JEE Main previous year questions testing conceptual depth beyond mere nomenclature.
| 4. How should I approach combustion and addition reaction questions on JEE hydrocarbon papers? | |
Ans. For combustion: use CₙH₂ₘOₓ + O₂ → CO₂ + H₂O, then balance systematically. For addition reactions: alkenes and alkynes add H₂, halogens, or HX across unsaturated bonds following Markovnikov's rule. Most JEE questions test reaction sequence prediction rather than mere equation balancing-focus on mechanism and product formation.
| 5. Which aromaticity rules and benzene substitution patterns are most tested in JEE Main previous year hydrocarbons questions? | |
Ans. Hückel's rule (4n+2 π electrons), ortho/para/meta directing effects in monosubstituted benzene, and polysubstitution patterns dominate JEE papers. Candidates should master electrophilic aromatic substitution mechanisms and how electron-donating versus electron-withdrawing groups influence reactivity. Refer to mind maps and flashcards to memorise directing group classifications quickly.
About this Document
4.69/5 Rating
Apr 25, 2026 Last updated
Document Description: Hydrocarbons: JEE Main Previous Year Questions (2021-2026) for JEE 2026 is part of Chemistry for JEE Main & Advanced preparation. The notes and questions for Hydrocarbons: JEE Main Previous Year Questions (2021-2026) have been prepared according to the JEE exam syllabus. Information about Hydrocarbons: JEE Main Previous Year Questions (2021-2026) covers topics like and Hydrocarbons: JEE Main Previous Year Questions (2021-2026) Example, for JEE 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Hydrocarbons: JEE Main Previous Year Questions (2021-2026).
Introduction of Hydrocarbons: JEE Main Previous Year Questions (2021-2026) in English is available as part of our Chemistry for JEE Main & Advanced for JEE & Hydrocarbons: JEE Main Previous Year Questions (2021-2026) in Hindi for Chemistry for JEE Main & Advanced course. Download more important topics related with notes, lectures and mock test series for JEE Exam by signing up for free. JEE: Hydrocarbons: JEE Main Previous Year Questions (2021-2026)
Description
Hydrocarbons: JEE Main Previous Year Questions (2021 of Chemistry is important for the exam. Get access to all the questions with solutions asked in past years of JEE exam. Download it from EduRev.
Information about Hydrocarbons: JEE Main Previous Year Questions (2021-2026)
In this doc you can find the meaning of Hydrocarbons: JEE Main Previous Year Questions (2021-2026) defined & explained in the simplest way possible. Besides explaining types of Hydrocarbons: JEE Main Previous Year Questions (2021-2026) theory, EduRev gives you an ample number of questions to practice Hydrocarbons: JEE Main Previous Year Questions (2021-2026) tests, examples and also practice JEE tests
Related Searches
Important questions, MCQs, Objective type Questions, Extra Questions, Sample Paper, Hydrocarbons: JEE Main Previous Year Questions (2021-2026), mock tests for examination, Previous Year Questions with Solutions, Semester Notes, Viva Questions, Hydrocarbons: JEE Main Previous Year Questions (2021-2026), study material, video lectures, shortcuts and tricks, Hydrocarbons: JEE Main Previous Year Questions (2021-2026), practice quizzes, Exam, Summary, pdf , ppt, Free, past year papers;