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Saturday, 31 October

JEE Main · Chemistry · Hydrocarbons

Reductive Ozonolysis Products

JEE Main asked Reductive Ozonolysis Products 16 times in 16 of the 108 shifts Lumi analysed, in 2020, 2021, 2022, 2023, 2024, 2025 and 2026. It belongs to Alkenes and Alkynes, in Hydrocarbons (Chemistry). The longest wait between two years asking it was 1 year. In 2021, 2022, 2024, 2025 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
16
in 16 shifts
Years
7 of 8
First asked
2020
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2021, 2022, 2023, 2024, 2025 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.20.40’170.08’200.10’210.14’220.07’230.09’240.38’250.22’26

Raw count: 2017: 0 in 1 shift · 2020: 1 in 12 shifts · 2021: 3 in 24 shifts · 2022: 4 in 24 shifts · 2023: 1 in 12 shifts · 2024: 2 in 18 shifts · 2025: 3 in 8 shifts · 2026: 2 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20262 of 9
  • 20253 of 8
  • 20242 of 18
  • 20231 of 12
  • 20224 of 24
  • 20213 of 24
  • 20201 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Diagram based is the usual form. Skill tested: multi-step.

  • Deduce alkene from ozonolysis products
  • Deduce compound from reaction sequence

Difficulty

Easy 1Medium 11Hard 4

4 of the 16 questions had a numerical answer.

Every question

All 16 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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
  2. 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
  3. 7 Apr 2025, Shift 2 · Q66The number of optically active products obtained from the complete ozonolysis of the given compound is :…MediumOtherHas a figure
  4. 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
  5. 3 Apr 2025, Shift 1 · Q65Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?MediumDiagram basedHas a figure
  6. 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
  7. 4 Apr 2024, Shift 2 · Q75In the above chemical reaction sequence "A" and "B" respectively areMediumDiagram basedHas a figure
  8. 8 Apr 2023, Shift 1 · Q89Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3\mathrm{O_3} per mole of (X) and gives one mole each of…MediumNumerical value
  9. 30 Jun 2022, Shift 1 · Q89A hydrocarbon 'X' is found to have molar mass of 80. A 10.0 mg of compound 'X' on hydrogenation consumed 8.40 mL of H2\mathrm{H_2} gas…HardNumerical value
  10. 27 Jun 2022, Shift 1 · Q74‘A’ and ‘B’ respectively are : A →(2) Zn - H2O(1) O3\xrightarrow[\text{(2) Zn - H}_2\text{O}]{\text{(1) O}_3} Ethane-1,2-dicarbaldehyde +…MediumSingle correct
  11. 29 Jul 2022, Shift 1 · Q73Which among the following pairs of the structures will give different products on ozonolysis ? (Consider the double bonds in the…HardDiagram basedHas a figure
  12. 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
  13. 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
  14. 26 Aug 2021, Shift 2 · Q60A chloro compound “A”. (i) forms aldehydes on ozonolysis followed by the hydrolysis. (ii) when vaporized completely 1.53 g of A, gives 448…MediumNumerical value
  15. 4 Aug 2021, Shift 2 · Q42Reaction of CH3−CH=CH2\mathrm{CH_3-CH=CH_2} with different reagents (List-I) yield different products (List-II). Match List-I with List-II :…MediumMatch the listHas a figure
  16. 8 Jan 2020, Shift 2 · Q42An unsaturated hydrocarbon X absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction :…MediumDiagram basedHas a figure

Shifts: 8 Jan 2020, Shift 2, 25 Jul 2021, Shift 1, 4 Aug 2021, Shift 2, 26 Aug 2021, Shift 2, 27 Jun 2022, Shift 1, 30 Jun 2022, Shift 1, 25 Jul 2022, Shift 1, 29 Jul 2022, Shift 1, 8 Apr 2023, Shift 1, 29 Jan 2024, Shift 1, 4 Apr 2024, Shift 2, 3 Apr 2025, Shift 1, 7 Apr 2025, Shift 2, 7 Apr 2025, Shift 1, 4 Apr 2026, Shift 1, 5 Apr 2026, Shift 1.

Same topic

Other ideas in Alkenes and Alkynes

Alkenes and Alkynes has 24 ideas JEE Main has asked; 14 of them came up in more than one question. The 12 most asked are below.

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