Hydrocarbons — Alkenes & Alkynes — JEE Main PYQs & Practice Questions

Hydrocarbons — Alkenes & Alkynes is a Chemistry chapter in the JEE Main syllabus. This page brings together 51 previous-year and practice questions on Hydrocarbons — Alkenes & Alkynes, organised into 6 topics: Preparation of Alkenes, Preparation of Alkynes, Electrophilic Addition, Markovnikov and Anti-Markovnikov, Ozonolysis and Oxidation and Acidity of Terminal Alkynes. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Hydrocarbons — Alkenes & Alkynes JEE Main PYQs as a free PDF (with answer key)

Revise this chapter: Revision notes · Formula sheet

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

Preparation of Alkenes

• But-2-yne and hydrogen (one mole each) are separately treated with (i) Pd/C and (ii) Na/…
• Match List - I with List - II : List - I (Chemicals) (a) Alcoholic potassium hydroxide…
• But-2-yne is reacted separately with one mole of Hydrogen as shown below : B ←(Na)…
• Which of the following is Lindlar catalyst?
• Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the…
• The reactions which cannot be applied to prepare an alkene by elimination, are Choose…
• Choose the correct set of reagents for the following conversion. trans (Ph-CH=CH-CH₃) →…

Preparation of Alkynes

• Consider the following reaction : The product Y formed is :
• The dibromo compound [P] (molecular formula: C₉H₁₀Br₂ ) when heated with excess sodamide…

Electrophilic Addition

• An optically active alkyl halide C₄ H₉ Br[A] reacts with hot KOH dissolved in ethanol…
• Alkenes decolorise bromine water due to addition of bromine across the double bond.
• The stereoisomers that are formed by electrophilic addition of bromine to…
• The number of possible isomeric products formed when 3-chloro-1-butene reacts with HCl…
• Which of the following is the most stable alkene?
• Consider the above chemical reaction. The total number of stereoisomers possible for…
• Amongst the following, the major product of the given chemical reaction is
• Given below are two statements : Statement I : The presence of weaker π-bonds make…
• The reaction CH₂=CH₂ + HBr → CH₃-CH₂Br is an example of:
• Consider the following molecule(X). The major product formed when the given molecule (X)…

Markovnikov and Anti-Markovnikov

• The product (C) in the below mentioned reaction is : CH₃-CH₂-CH₂-Br →(KOH_((alc))) A…
• 3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product…
• The major product formed in the following reaction is : CH₃CH = CHCH(CH₃)₂ →(HBr)
• Which one of the following carbonyl compounds cannot be prepared by addition of water on…
• CH₃-CH₂-CH₂-Br+NaOH →(C₂ H₅ OH) Product 'A' Product A →(H₂O) Product “B”; →(Diborane)…
• The product of hydroboration-oxidation of propyne is:
• Which of the following reaction is correct?
• The product of addition of HBr to propene in presence of peroxide is:
• Ph-CH=CH₂ →((PhCOO)₂) Product Consider the above reaction A. The reaction proceeds…
• Given below are two statements : one is labelled as Assertion (A) and the other is…

Ozonolysis and Oxidation

• Given below are two statements: Statement I : Ozonolysis followed by treatment with Zn…
• An alkene(X) on ozonolysis followed by reduction gives following products. The alkene(X)…
• A compound ‘A’ on reaction with ‘X’ and ‘Y’ produces the same major product but…
• A hydrocarbon ' X ' with formula C₆ H₈ uses two moles of H₂ on catalytic hydrogenation…
• An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with…
• The major product of the following reaction is P. CH₃ C≡C-CH₃ →((i) Na /liq. NH₃) 'P'…
• An unsaturated hydrocarbon X absorbs two hydrogen molecules on catalytic hydrogenation…
• 17 mg of a hydrocarbon (M.F. C₁₀H₁₆) takes up 8.40 mL of the H₂ gas measured at 0°C and…
• An organic compound 'A' C₄H₈ on treatment with KMnO₄/H⁺ yields compound 'B' C₃H₆O…
• Which among the following pairs of the structures will give different products on…
• Identify product [A], [B] and [C] in the following reaction sequence. CH₃-C ≡ CH →(Pd /…
• Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?
• A compound ' X′ absorbs 2 moles of hydrogen and ' X ' upon oxidation with KMnO₄ | H⁺…
• The number of optically active products obtained from the complete ozonolysis of the…
• Two isomers 'A' and 'B' with molecular formula C₄H₈ give different products on oxidation…
• Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O₃ per mole…
• A hydrocarbon 'X' is found to have molar mass of 80. A 10.0 mg of compound 'X' on…
• When ethanol is heated with conc. H₂ SO₄, a gas is produced. The compound formed, when…
• Identify A in the following reaction.

Acidity of Terminal Alkynes

• The acidity of terminal alkynes is due to:
• The incorrect statement regarding ethyne is
• Given below are two statements : Statement I : One mole of propyne reacts with excess of…

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 — Alkanes
• 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 — Alkenes & Alkynes questions are there for JEE Main?

PrepWiser has 51 Hydrocarbons — Alkenes & Alkynes questions for JEE Main, grouped into 6 topics such as Preparation of Alkenes, Preparation of Alkynes and Electrophilic Addition.

Are these Hydrocarbons — Alkenes & Alkynes 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 — Alkenes & Alkynes questions?

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