Hydrocarbons — Alkanes — JEE Main PYQs & Practice Questions

Hydrocarbons — Alkanes is a Chemistry chapter in the JEE Main syllabus. This page brings together 32 previous-year and practice questions on Hydrocarbons — Alkanes, organised into 4 topics: Preparation of Alkanes, Conformations, Free Radical Halogenation and Combustion and Cracking. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Hydrocarbons — Alkanes JEE Main PYQs as a free PDF (with answer key)

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Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Preparation of Alkanes

• Which reagent converts alkyl halide to alkane?
• RMgI when treated with ice cold water liberated a gas which occupied 1.4dm³/g at STP…
• CH₃CH₂-OH →(iii) NaOH, CaO, Δ](i) Jone's Reagent P Consider the above reaction sequence…
• Given below are two statements : Statement I : Methane can be prepared by…

Conformations

• Which of the following conformations will be the most stable?
• Given below are two statements : Statement I : There are several conformers for n…
• Conformational isomers can be separated at room temperature.
• The dihedral angle in staggered form of Newman projection of 1, 1, 1-Trichloro ethane is…
• Arrange the following conformational isomers of n-butane in order of their increasing…
• In the following structures, which on is having staggered conformation with maximum…
• The incorrect statement regarding conformations of ethane is :
• Staggered and eclipsed conformers of ethane are :

Free Radical Halogenation

• The total number of monohalogenated organic products in the following (including…
• Total number of isomeric compounds (including stereoisomers) formed by monochlorination…
• 2-chlorobutane +Cl₂ → C₄ H₈ Cl₂ (isomers) Total number of optically active isomers shown…
• Propane molecule on chlorination under photochemical condition gives two di-chloro…
• Alkanes are generally unreactive due to the presence of only strong C-C and C-H sigma…
• Given below are two statements : Statement (I) : Neopentane forms only one…
• Presence of which reagent will affect the reversibility of the following reaction, and…
• Consider the isomers of hydrocarbon with molecular formula C₅H₁₀. These isomers do not…
• The total number of monobromo derivatives formed by the alkanes with molecular formula…
• Cl(•)+CH₄ → A+B A and B in the above atmospheric reaction step are :
• Total number of isomers (including stereoisomers) obtained on monochlorination of…
• Number of isomeric products formed by monochlorination of 2-methylbutane in presence of…
• An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination…
• Excess of isobutane on reaction with Br₂ in presence of light at 125°C gives which one…
• n-Butane on monochlorination under photochemical condition gives an optically active…
• Number of bromo derivatives obtained on treating ethane with excess of Br₂ in diffused…

Combustion and Cracking

• The reactions which produce alcohol as the product are : A. CH₄+O₂→(Mo₂O₃, Δ) B…
• One mole of an alkane (x) requires 8 mole oxygen for complete combustion. Sum of number…
• Given below are two statements : Statement I : 2-methylbutane on oxidation with KMnO₄…
• The compound (X) on (i) on heating in the presence of anhydrous AlCl₃ and HCl gas gives…

More Chemistry chapters

• Mole Concept & Stoichiometry
• Atomic Structure
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Ionic Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Electrochemistry
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• Hydrogen & s-Block Elements
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes & Ketones
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Carbohydrates & Biomolecules
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Hydrocarbons — Alkanes questions are there for JEE Main?

PrepWiser has 32 Hydrocarbons — Alkanes questions for JEE Main, grouped into 4 topics such as Preparation of Alkanes, Conformations and Free Radical Halogenation.

Are these Hydrocarbons — Alkanes questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Hydrocarbons — Alkanes questions?

Open any Hydrocarbons — Alkanes question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.