Hydrocarbons: Alkenes & Alkynes JEE Main PYQs, 2020 to 2026

Hydrocarbons: Alkenes & Alkynes has 52 questions in JEE Main papers from 2020 to 2026, about 7.4 per year across all shifts. The free PDF has 28 of them, each with its answer and a step-by-step solution. The most asked topic is Electrophilic Addition (20 questions), followed by Ozonolysis and Oxidation (15) and Preparation of Alkenes (10).

Asked in JEE Main: 522020–2026, all shifts
In this free PDF: 28with answers + solutions
Asked in 2026: 20Latest paper: 2026 Apr S2
Most asked topic: Electrophilic Addition20 Qs · 38% of the chapter
Difficulty mix: 36% easy · 57% medium · 7% hardof the questions in the PDF

Answer key includedNo loginStep-by-step solutions

Source: official NTA JEE Main papers · Updated 2 Oct 2026

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Hydrocarbons: Alkenes & Alkynes questions per year

Year	Asked	In PDF
2026	20	9
2025	7	3
2024	2	2
2023	6	4
2022	7	4
2021	7	4
2020	3	2

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 28 of the 52 asked.

Topic-wise weightage by year

How many Hydrocarbons: Alkenes & Alkynes questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Topic	Asked	Share	2026	2025	2024	2023	2022	2021	2020
Electrophilic Addition	20	38%	13	1	·	2	1	3	·
Ozonolysis and Oxidation	15	29%	·	4	1	3	4	2	1
Preparation of Alkenes	10	19%	6	·	·	1	1	2	·
Markovnikov and Anti-Markovnikov	3	6%	·	·	·	·	1	·	2
Acidity of Terminal Alkynes	2	4%	·	1	1	·	·	·	·
Preparation of Alkynes	2	4%	1	1	·	·	·	·	·
All topics	52	100%	20	7	2	6	7	7	3

Swipe the table sideways for older years.

Newest questions (2026)

All 9 JEE Main 2026 Hydrocarbons: Alkenes & Alkynes questions in the free PDF, latest shift first. The 2026 papers asked 20 in all.

JEE Main 2026 · 8 Apr · Shift 2 · Electrophilic Addition

n-Butane on monochlorination under photochemical condition gives an optically active compound " P ". " P " on further chlorination gives dichloro compounds.

The number of dichloro compounds obtained (ignore stereoisomers) is :
Solve it with the step-by-step solution →
JEE Main 2026 · 6 Apr · Shift 1 · Electrophilic Addition

Given below are two statements :

Statement I : Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium acetate and reaction of ${\mathrm{CH}}_{3}{\mathrm{MgBr}}$ with water.

Statement II : Methane cannot be prepared from unsaturated hydrocarbons and by Wurtz reaction.

In the light of the above statements, choose the correct answer from the options given below

Solve it with the step-by-step solution →
JEE Main 2026 · 6 Apr · Shift 2 · Electrophilic Addition

An alkane $(Y)$ requires 8 moles of oxygen for complete combustion and on chlorination with ${\mathrm{Cl}}_{2}/{\mathrm{h}}\nu,({\mathrm{Y}})$ gives only one monochlorinated product $({\mathrm{Z}})$ . The total number of primary carbon atoms in $(Y)$ is $\_\_\_\_$ .
Solve it with the step-by-step solution →
JEE Main 2026 · 5 Apr · Shift 2 · Electrophilic Addition

Identify the correct IUPAC name of hydrocarbon $(x)$ containing three primary carbon atoms and with molar mass $72{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ .

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JEE Main 2026 · 5 Apr · Shift 2 · Preparation of Alkenes

IUPAC name of the some alkenes are given below.

Find out the correct stability order.

A. 2-Methylbut-2-ene

B. cis-But-2-ene

C. 2,3-Dimethylbut-2-ene

D. Prop-1-ene

Choose the correct answer from the options given below :
Solve it with the step-by-step solution →
JEE Main 2026 · 2 Apr · Shift 1 · Electrophilic Addition

Consider the isomers of hydrocarbon with molecular formula $C_{5}H_{{10}}$ . These isomers do not decolourise $KMnO_{4}$ solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is ________.
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JEE Main 2026 · 2 Apr · Shift 1 · Electrophilic Addition

One mole of an alkane (x) requires 8 mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane (x) is ________.
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JEE Main 2026 · 2 Apr · Shift 2 · Electrophilic Addition

The compound (X) on
(i) on heating in the presence of anhydrous AlCl₃ and HCl gas gives 2,4-dimethyl pentane
(ii) aromatization gives toluene and
(iii) cyclisation gives methyl cyclohexane
The correct name of compound (X) is:
Solve it with the step-by-step solution →
JEE Main 2026 · 22 Jan · Shift 1 · Preparation of Alkenes

The cycloalkene $({\mathrm{X}})$ on bromination consumes one mole of bromine per mole of $({\mathrm{X}})$ and gives the product $({\mathrm{Y}})$ in which ${\mathrm{C}}:{\mathrm{Br}}$ ratio is 3:1. The percentage of bromine in the product $({\mathrm{Y}})$ is $\_\_\_\_$ %. (Nearest integer)

(Given : molar mass in ${\mathrm{g}}{\mathrm{mol}}^{{-1}}{\mathrm{H}}:1,{\mathrm{C}}:12,{\mathrm{O}}:16,{\mathrm{Br}}:80$ )
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Sample questions from recent papers

JEE Main 2025 · 7 Apr · Shift 1 · Ozonolysis and Oxidation

Given below are two statements:

Statement I : Ozonolysis followed by treatment with $\mathrm{Zn}, \mathrm{H}_2 \mathrm{O}$ of cis-2-butene gives ethanal.

Statement II : The product obtained by ozonolysis followed by treatment with $\mathrm{Zn}, \mathrm{H}_2 \mathrm{O}$ of 3, 6-dimethyloct-4-ene has no chiral carbon atom.

In the light of the above statements, choose the correct answer from the options given below

(A)Statement I is false but Statement II are true
(B) Both Statement I and Statement II are False
(C) Statement I is true but Statement II is false
(D) Both Statement I and Statement II are true

Show answer

Answer: (C)

Step-by-step solution

JEE Main 2025 · 2 Apr · Shift 1 · Preparation of Alkynes

An optically active alkyl halide $\mathrm{C}_4 \mathrm{H}_9 \mathrm{Br}[\mathrm{A}]$ reacts with hot KOH dissolved in ethanol and forms alkene $[B]$ as major product which reacts with bromine to give dibromide $[C]$ . The compound [C] is converted into a gas [D] upon reacting with alcoholic $\mathrm{NaNH}_2$ . During hydration 18 gram of water is added to 1 mole of gas [D] on warming with mercuric sulphate and dilute acid at 333 K to form compound [E]. The IUPAC name of compound [ E ] is :

(A) Butan-2-ol
(B) But-2-yne
(C) Butan-2-one
(D) Butan-1-al

Show answer

Answer: (C)

Step-by-step solution

JEE Main 2025 · 22 Jan · Shift 1 · Acidity of Terminal Alkynes

Given below are two statements :

Statement I : One mole of propyne reacts with excess of sodium to liberate half a mole of $\mathrm{H}_2$ gas.

Statement II : Four g of propyne reacts with $\mathrm{NaNH}_2$ to liberate $\mathrm{NH}_3$ gas which occupies 224 mL at STP.

In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Both Statement I and Statement II are incorrect
(B)Statement I is incorrect but Statement II is correct
(C)Both Statement I and Statement II are correct
(D)Statement I is correct but Statement II is incorrect

Show answer

Answer: (D)

Step-by-step solution

JEE Main 2021 · 16 Mar · Shift 1 · Preparation of Alkenes

Which of the following is Lindlar catalyst?

(A)Partially deactivated palladised charcoal
(B)Zinc chloride and HCl
(C)Sodium and Liquid NH₃
(D)Cold dilute solution of KMnO₄

Show answer

Answer: (A)

Step-by-step solution

JEE Main 2020 · 5 Sep · Shift 2 · Markovnikov and Anti-Markovnikov

The major product formed in the following reaction is :
CH₃CH = CHCH(CH₃)₂

\overset{HBr}{\longrightarrow}

(A)Br(CH₂)₃CH(CH₃)₂
(B)CH₃CH(Br)CH₂CH(CH₃)₂
(C)CH₃CH₂CH(Br)CH(CH₃)₂
(D)CH₃CH₂CH₂C(Br)(CH₃)₂

Show answer

Answer: (D)

Step-by-step solution

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Frequently asked

How many questions come from Hydrocarbons: Alkenes & Alkynes in JEE Main?

52 questions from 2020 to 2026, about 7.4 per year. In 2026 it had 20. The free PDF has 28 of them.

Which Hydrocarbons: Alkenes & Alkynes topics are most important for JEE Main?

By past papers: Electrophilic Addition (38%), Ozonolysis and Oxidation (29%) and Preparation of Alkenes (19%) of all Hydrocarbons: Alkenes & Alkynes questions.

Is the Hydrocarbons: Alkenes & Alkynes PYQ PDF free?

Yes. The PDF, the answer key and every step-by-step solution on PrepWiser are free, with no login needed to practise.

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