JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 8 April 2023, Shift 1, Chemistry Q89

Question 89 of 90 in this shift, Chemistry question 29 of 30, Section B.

Molar 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 ethanal and propanone is ________

\mathrm{g\,mol^{-1}}

(Molar mass of C : 12

\mathrm{g\,mol^{-1}}

, H : 1

\mathrm{g\,mol^{-1}}

)

Official answer

NTA final key.

Chapter: Hydrocarbons
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
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

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.