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Friday, 9 October

JEE Main Chemistry · Hydrocarbons

Alkenes and Alkynes in JEE Main

Alkenes and Alkynes (Chemistry, Hydrocarbons) came 32 times in 27 of the 42 JEE Main shifts Lumi analysed, across 15 distinct ideas. 18 of them came in 2024–26; it was last asked in 2026.

Questions
32
in 27 shifts
Ideas asked
15
6 asked more than once
Numerical answer
4
13% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
0483’173’203’214’221’235’248’255’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 3Medium 21Hard 8

Format

  • Single correct15 Q
  • Diagram based10 Q
  • Numerical value4 Q
  • Two statements2 Q
  • Other1 Q
Ideas inside the topic
15 ideas
Where it sits

Part of Hydrocarbons, which had 34 questions in all. Alkenes and Alkynes accounts for 94% of them. In Lumi's JEE taxonomy it belongs to Organic Chemistry.

Some questions sit in other chapters too: Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Amines, Haloalkanes and Haloarenes.

Every question

All 32 Alkenes and Alkynes questions

Newest first, each with its options and official answer.

  1. 4 Apr 2026, Shift 1 · Q64An alkene (X) on ozonolysis followed by reduction gives following products. H−CHO\mathrm{H-CHO} (2 moles), OHC−CO−CHO\mathrm{OHC-CO-CHO}…HardDiagram basedHas a figure
  2. 4 Apr 2026, Shift 2 · Q64Compound (X) is subjected to the sequence of reactions as shown above. Molar mass of the major product (Y) formed is ________…MediumDiagram basedHas a figure
  3. 5 Apr 2026, Shift 1 · Q64"P" is a hydrocarbon of molecular formula:- C8H14\mathrm{C_8H_{14}}. On ozonolysis, "P" forms "Q". "Q" on treatment with alkali under reflux…HardDiagram basedHas a figure
  4. 6 Apr 2026, Shift 1 · Q66Given below are two statements: Statement I: 3-phenylpropene reacts with HBr and gives secondary alkyl bromide having a chiral carbon atom…MediumTwo statements
  5. 6 Apr 2026, Shift 2 · Q65An optically active alkyl bromide C4H9Br\mathrm{C_4H_9Br}, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to…MediumSingle correct
  6. 2 Apr 2025, Shift 1 · Q66An optically active alkyl halide C4H9Br\mathrm{C_4H_9Br} [A] reacts with hot KOH dissolved in ethanol and forms alkene [B] as major product…MediumSingle correct
  7. 2 Apr 2025, Shift 2 · Q75Consider the above sequence of reactions. 151 g of 2-bromopentane is made to react. Yield of major product P is 80% whereas Q is 100%.…MediumNumerical valueHas a figure
  8. 3 Apr 2025, Shift 1 · Q65Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?MediumDiagram basedHas a figure
  9. 4 Apr 2025, Shift 2 · Q65Consider the following molecule (X). The structure of X is [figure: tricyclic fused polycyclic hydrocarbon (X) containing a cyclopentene…HardDiagram basedHas a figure
  10. 7 Apr 2025, Shift 1 · Q67Given below are two statements: Statement I: Ozonolysis followed by treatment with Zn, H2O\mathrm{H_2O} of cis-2-butene gives ethanal.…MediumTwo statements
  11. 7 Apr 2025, Shift 2 · Q66The number of optically active products obtained from the complete ozonolysis of the given compound is :…MediumOtherHas a figure
  12. 7 Apr 2025, Shift 2 · Q75Identify the structure of the final product (D) in the following sequence of the reactions :…MediumNumerical valueHas a figure
  13. 8 Apr 2025, Shift 2 · Q651,2-dibromocyclooctane →(ii) NaNH2 (iii) Hg2+/H+ (iv) Zn–Hg / H+(i) KOH (alc.)\xrightarrow[\text{(ii) NaNH}_2\ \text{(iii) Hg}^{2+}/\text{H}^+\ \text{(iv) Zn–Hg / H}^+]{\text{(i) KOH (alc.)}}…MediumSingle correctHas a figure
  14. 9 Apr 2024, Shift 1 · Q76Identify the product A and product B in the following set of reactions. [figure: CH3−CH=CH2\mathrm{CH_3-CH=CH_2}…EasySingle correctHas a figure
  15. 29 Jan 2024, Shift 1 · Q74Identify product A and product B :MediumDiagram basedHas a figure
  16. 29 Jan 2024, Shift 1 · Q89[figure: trans-2-butene drawn as CH3_3 and H on the left carbon, H and CH3_3 on the right carbon (CH3_3 top-left, H bottom-left, H…EasyNumerical valueHas a figure
  17. 31 Jan 2024, Shift 1 · Q76The product (C) in the below mentioned reaction is :…EasySingle correct
  18. 31 Jan 2024, Shift 2 · Q75Major product of the following reaction is -HardDiagram basedHas a figure
  19. 8 Apr 2023, Shift 2 · Q71Major product 'P' formed in the following reaction is: [reaction: CH2=CH−CH2−CH2−COOH\mathrm{CH_2{=}CH{-}CH_2{-}CH_2{-}COOH} (pent-4-enoic acid, drawn as…MediumDiagram basedHas a figure
  20. 25 Jul 2022, Shift 1 · Q73A compound 'A' on reaction with 'X' and 'Y' produces the same major product but different by product 'a' and 'b'. Oxidation of 'a' gives a…MediumSingle correctHas a figure
  21. 28 Jul 2022, Shift 1 · Q73Choose the correct option for the following reactions. (CH3)3C−CH=CH2\mathrm{(CH_3)_3C-CH=CH_2} (3,3-dimethylbut-1-ene, drawn as…MediumSingle correctHas a figure
  22. 24 Jun 2022, Shift 1 · Q90The major product 'A' of the following given reaction has ______ sp2sp^2 hybridized carbon atoms. 2,7-Dimethyl-2,6-octadiene…HardNumerical value
  23. 29 Jun 2022, Shift 1 · Q73Two isomers 'A' and 'B' with molecular formula C4H8\mathrm{C_4H_8} give different products on oxidation with KMnO4\mathrm{KMnO_4} in acidic…MediumSingle correct
  24. 25 Jul 2021, Shift 1 · Q42An Organic compound 'A' C4H8\mathrm{C_4H_8} on treatment with KMnO4/H+\mathrm{KMnO_4/H^+} yields compound 'B' C3H6O\mathrm{C_3H_6O}. Compound 'A'…MediumSingle correct
  25. 16 Mar 2021, Shift 2 · Q43An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with ammonical silver nitrate forms a bright silver mirror…MediumSingle correctHas a figure
  26. 16 Mar 2021, Shift 2 · Q44[figure: cyclohexene reacts with reagent A to give 1,4-dichlorocyclohex-2-ene (a cyclohexene ring with Cl on the two ring carbons para to…MediumDiagram basedHas a figure
  27. 9 Jan 2020, Shift 2 · Q43Which of the following reactions will not produce a racemic product ?HardSingle correctHas a figure
  28. 2 Sep 2020, Shift 1 · Q41The major product in the following reaction is : 1-methyl-1-vinylcyclopentane (H3C\mathrm{H_3C} and CH=CH2\mathrm{CH=CH_2} on the same ring…HardDiagram basedHas a figure
  29. 6 Sep 2020, Shift 2 · Q30The increasing order of the boiling points of the major products A, B and C of the following reactions will be : (a) [figure: but-1-ene,…MediumSingle correctHas a figure
  30. 2 Apr 2017 (offline) · Q52Which of the following, upon treatment with *tert*-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine ?HardSingle correctHas a figure
  31. 2 Apr 2017 (offline) · Q56The major product obtained in the following reaction is : [reaction: (+)-C6H5CH(Br)CH2C6H5\mathrm{C_6H_5CH(Br)CH_2C_6H_5} (Br on wedge, H on hash at the…MediumSingle correctHas a figure
  32. 2 Apr 2017 (offline) · Q583-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the…MediumSingle correct