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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceDiagram basedHardMulti-step

JEE Main 4 April 2026, Shift 1, Chemistry Q64

Question 64 of 75 in this shift, Chemistry question 14 of 25, Section A.

An alkene (X) on ozonolysis followed by reduction gives following products. H−CHO\mathrm{H-CHO} (2 moles), OHC−CO−CHO\mathrm{OHC-CO-CHO} (H-C(=O)-C(=O)-C(=O)-H), CH3−CO−CO−CO−CH3\mathrm{CH_3-CO-CO-CO-CH_3} (CH3-C(=O)-C(=O)-C(=O)-CH3) The alkene (X) is:

The figure, in words

Options are skeletal structures of six-membered rings bearing exocyclic double bonds and methyl groups (ozonolysis precursors of the given carbonyl products).
  1. (1)[figure: six-membered ring structure with one ring C=C and several exocyclic double-bonded (=CH2 type) carbons and one methyl substituent, drawn in skeletal form]
  2. (2)[figure: six-membered ring structure with one ring C=C, exocyclic =CH2 at top and bottom, one methyl and one further exocyclic double bond on the right side, skeletal form]
  3. (3)[figure: six-membered ring with two ring C=C, exocyclic double bonds on the right and lower left, methyl groups at upper left, lower right and bottom, skeletal form]
  4. (4)[figure: six-membered ring with two ring C=C, methyl at top, exocyclic double bonds at upper right and lower left, methyl at lower right, skeletal form]Official answer

Official answer

Option 4

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Alkenes and Alkynes
Idea tested
Reductive Ozonolysis Products

Same idea in other shifts

Asked 8× in all
  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. 3 Apr 2025, Shift 1 · Q65Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?MediumDiagram basedHas a figure
  3. 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
  4. 7 Apr 2025, Shift 2 · Q66The number of optically active products obtained from the complete ozonolysis of the given compound is :…MediumOtherHas a figure
  5. 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
  6. 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
  7. 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

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.