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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceMatch the listMediumRecall

JEE Main 4 August 2021, Shift 2, Chemistry Q42

Question 42 of 90 in this shift, Chemistry question 12 of 30, Section A.

Reaction 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 : List-I : Reagents A. O3/Zn, H2O\mathrm{O_3/Zn,\ H_2O} B. KMnO4/H2SO4\mathrm{KMnO_4/H_2SO_4} C. KMnO4/NaOH\mathrm{KMnO_4/NaOH} D. H3O+\mathrm{H_3O^+} List-II : Products on reaction with CH3−CH=CH2\mathrm{CH_3-CH=CH_2} I. Ethanoic acid II. Propan-2-ol III. Ethanal IV. Propane-1, 2-diol The correct match is :

The figure, in words

Two-column table: List-I (Reagents) A-D and List-II (Products on reaction with CH3-CH=CH2) I-IV, as transcribed in the stem.
  1. (1)A-III, B-I, C-IV, D-IIOfficial answer
  2. (2)A-III, B-IV, C-I, D-II
  3. (3)A-II, B-I, C-IV, D-III
  4. (4)A-IV, B-I, C-II, D-III

Official answer

Option 1

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.