JEE Main · Chemistry · Hydrocarbons
General Stoichiometry of Alkane Combustion
JEE Main asked General Stoichiometry of Alkane Combustion 2 times in 2 of the 108 shifts Lumi analysed, all in 2026. It belongs to Alkanes and Free Radicals, in Hydrocarbons (Chemistry). In 2026 it came in more than one shift of the same year.
Updated 2026-10-24
- Times asked
- 2
- in 2 shifts
- Years
- 1 of 8
- First asked
- 2026
- the only year
- Pattern
- New since 2024
- across the analysed shifts
Questions on this idea a shift, by year
2017–2026. Asked in 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.
Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 2 in 9 shifts.
Shift by shift
Each square is one analysed shift, in date order. Open a filled one for that paper.
How JEE Main framed it
Numerical value is the usual form. Skill tested: calculation.
- Formula of alkane from oxygen needed
- Structure of alkane from combustion and chlorination
Difficulty
2 of the 2 questions had a numerical answer.
Every question
All 2 questions
From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.
- 6 Apr 2026, Shift 2 · Q72An alkane (Y) requires 8 moles of oxygen for complete combustion and on chlorination with , (Y) gives only one…MediumNumerical value
- 2 Apr 2026, Shift 1 · Q73One mole of an alkane (x) requires mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane (x)…EasyNumerical value
Shifts: 2 Apr 2026, Shift 1, 6 Apr 2026, Shift 2.
Same topic
Other ideas in Alkanes and Free Radicals
Alkanes and Free Radicals has 18 ideas JEE Main has asked; 11 of them came up in more than one question. The 12 most asked are below.
- Wolff-Kishner Reduction to Alkanes4× · 2024
- Halogenation Chain Mechanism3× · 2026
- Clemmensen Reduction to Alkanes3× · 2024
- Alkane Synthesis via Grignard Protonation3× · 2022
- Ethane and Butane Conformers3× · 2022
- Catalytic Isomerization of Alkanes2× · 2026
- Hydrolysis of Grignard Reagents2× · 2026
- Kolbe's Electrolytic Method2× · 2026
- Stereochemistry of Free Radical Halogenation2× · 2024
- Aromatization (Reforming) of Alkanes2× · 2021
- Free Radical Stability Trendsonce · 2025
- Melting Point Alternation Effectonce · 2025