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JEE Main General Organic Chemistry and Isomerism questions with solutions

Electronic effects, acidity and basicity, reaction mechanisms, and structural and stereoisomerism including chirality. 13 questions from our 2016–2025 JEE Main pattern papers, from the Class 11 Chemistry syllabus. Each has the answer and a full solution.

Also practise: General Organic Chemistry and Isomerism for JEE Advanced

JEE Main 2025

The correct order of acid strength of p-nitrobenzoic acid (I), p-chlorobenzoic acid (II), benzoic acid (III) and p-methoxybenzoic acid (IV) in water…JEE Main 2025 · easy
The total number of stereoisomers possible for hex-3-ene-2,5-diol, CH3CH(OH)CH=CHCH(OH)CH3, isJEE Main 2025 · hard

JEE Main 2024

Exists to the greatest extent in its enol form at equilibrium?JEE Main 2024 · medium

JEE Main 2023

JEE Main 2022

Ly arranges the compounds in decreasing order of acidity of the most acidic hydrogen in each? I: cyclopenta-1,3-diene (C5H6), II: propyne, III…JEE Main 2022 · medium

JEE Main 2020

The correct order of acidic strength for o-nitrobenzoic acid (I), p-nitrobenzoic acid (II), benzoic acid (III) and p-methoxybenzoic acid (IV) isJEE Main 2020 · medium
The total number of stereoisomers (geometrical plus optical) possible for CH3-CH=CH-CH(OH)-CH(Cl)-CH3 isJEE Main 2020 · medium

JEE Main 2019

Benzene is treated in sequence with (i) CH3COCl/anhyd. AlCl3, (ii) Br2/FeBr3, and (iii) Zn-Hg/conc. HCl. The final major product isJEE Main 2019 · medium
The total number of stereoisomers (including meso forms) of pentane-2,3,4-triol, CH3CH(OH)CH(OH)CH(OH)CH3, isJEE Main 2019 · hard

JEE Main 2018

The correct order of the magnitude of heat of hydrogenation (to the corresponding alkane) of (I) but-1-ene, (II) cis-but-2-ene, (III) trans-but-2-ene…JEE Main 2018 · medium

JEE Main 2017

The number of acyclic alkene isomers of C6H12 (counting geometrical and optical isomers separately) that give 3-methylpentane on catalytic…JEE Main 2017 · hard

JEE Main 2016

The number of aromatic species among the following is: cyclopentadienyl anion, cycloheptatrienyl cation, cyclooctatetraene, pyridine, cyclopropenyl…JEE Main 2016 · medium

Other Chemistry topics

Alcohols, Phenols, Ethers and Haloalkanes 16 Atomic Structure 12 Biomolecules and Polymers 14 Carbonyl Compounds, Carboxylic Acids and Amines 25 Chemical Bonding and Molecular Structure 14 Chemical Equilibrium 10 Chemical Kinetics 13 Chemical Thermodynamics 16 Coordination Compounds 18 Electrochemistry 18 Hydrocarbons 16 Ionic Equilibrium 11 Mole Concept and Stoichiometry 12 Periodic Properties 9 Qualitative and Practical Chemistry 8 Redox Reactions and Titrations 9 Solutions, Solid State and Surface Chemistry 19 d- and f-Block Elements and Metallurgy 14 s-Block, p-Block Elements and Hydrogen 23