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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 27 June 2022, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

‘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 + Glyoxal/Oxaldehyde B →(2) Zn - H2O(1) O3\xrightarrow[\text{(2) Zn - H}_2\text{O}]{\text{(1) O}_3} 5-oxohexanal
  1. (1)1-methylcyclohex-1,3-diene & cyclopentene.
  2. (2)Cyclohex-1,3-diene & cyclopentene
  3. (3)1-methylcyclohex-1,4-diene & 1-methylcyclopent-1-ene
  4. (4)Cyclohex-1,3-diene & 1-methylcyclopent-1-eneOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Hydrocarbons
Topic
Alkenes and Alkynes
Idea tested
Reductive Ozonolysis Products

Same idea in other shifts

Asked 16× in all
  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. 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
  3. 3 Apr 2025, Shift 1 · Q65Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?MediumDiagram basedHas 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. 7 Apr 2025, Shift 2 · Q66The number of optically active products obtained from the complete ozonolysis of the given compound is :…MediumOtherHas a figure
  6. 4 Apr 2024, Shift 2 · Q75In the above chemical reaction sequence "A" and "B" respectively areMediumDiagram basedHas a figure
  7. 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
  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

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.