JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 26 August 2021, Shift 2, Chemistry Q60

Question 60 of 90 in this shift, Chemistry question 30 of 30, Section B.

A chloro compound “A”. (i) forms aldehydes on ozonolysis followed by the hydrolysis. (ii) when vaporized completely 1.53 g of A, gives 448 mL of vapour at STP. The number of carbon atoms in a molecule of compound

\mathbf{A}

is __________.

Official answer

NTA final key.

Chapter: Haloalkanes and Haloarenes
Topic: Alkenes and Alkynes
Idea tested: Reductive Ozonolysis Products

Same idea in other shifts

Asked 16× in all

4 Apr 2026, Shift 1 · Q64An alkene (X) on ozonolysis followed by reduction gives following products. $\mathrm{H-CHO}$ (2 moles), $\mathrm{OHC-CO-CHO}$ …HardDiagram basedHas a figure
5 Apr 2026, Shift 1 · Q64"P" is a hydrocarbon of molecular formula:- $\mathrm{C_8H_{14}}$ . On ozonolysis, "P" forms "Q". "Q" on treatment with alkali under reflux…HardDiagram basedHas a figure
3 Apr 2025, Shift 1 · Q65Which compound would give 3-methyl-6-oxoheptanal upon ozonolysis?MediumDiagram basedHas a figure
7 Apr 2025, Shift 1 · Q67Given below are two statements: Statement I: Ozonolysis followed by treatment with Zn, $\mathrm{H_2O}$ of cis-2-butene gives ethanal.…MediumTwo statements
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 Apr 2024, Shift 2 · Q75In the above chemical reaction sequence "A" and "B" respectively areMediumDiagram basedHas a figure
29 Jan 2024, Shift 1 · Q89[figure: trans-2-butene drawn as CH $_3$ and H on the left carbon, H and CH $_3$ on the right carbon (CH $_3$ top-left, H bottom-left, H…EasyNumerical valueHas a figure
8 Apr 2023, Shift 1 · Q89Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of $\mathrm{O_3}$ 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.