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Friday, 9 October

JEE Main Chemistry · Organic Chemistry: Some Basic Principles and Techniques

Resonance and Hyperconjugation in JEE Main

Resonance and Hyperconjugation (Chemistry, Organic Chemistry: Some Basic Principles and Techniques) came 15 times in 13 of the 42 JEE Main shifts Lumi analysed, across 6 distinct ideas. 10 of them came in 2024–26; it was last asked in 2026.

Questions
15
in 13 shifts
Ideas asked
6
3 asked more than once
Numerical answer
3
20% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
0361’172’201’210’221’236’241’253’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 3Medium 11Hard 1

Format

  • Single correct9 Q
  • Numerical value3 Q
  • Diagram based2 Q
  • Two statements1 Q
Ideas inside the topic
6 ideas
Where it sits

Part of Organic Chemistry: Some Basic Principles and Techniques, which had 91 questions in all. Resonance and Hyperconjugation accounts for 16% of them. In Lumi's JEE taxonomy it belongs to Organic Chemistry.

Some questions sit in other chapters too: Alcohols, Phenols and Ethers, Aldehydes, Ketones and Carboxylic Acids, Haloalkanes and Haloarenes, Hydrocarbons.

Every question

All 15 Resonance and Hyperconjugation questions

Newest first, each with its options and official answer.

  1. 2 Apr 2026, Shift 2 · Q63Given below are two statements: Statement I: In…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q63IUPAC name of the some alkenes are given below. Find out the correct stability order. A. 2-Methylbut-2-ene B. ciscis-But-2-ene C. 2,…MediumSingle correct
  3. 6 Apr 2026, Shift 2 · Q63Shown below is the structure of methyl acetate with three different α\alpha, β\beta and γ\gamma carbon - oxygen bonds. The correct…MediumDiagram basedHas a figure
  4. 3 Apr 2025, Shift 2 · Q65Given below are two statements: Statement I : Hyperconjugation is not a permanent effect. Statement II : In general, greater the number of…EasyTwo statements
  5. 6 Apr 2024, Shift 2 · Q88Number of carbocations from the following that are not stabilized by hyperconjugation is ________.MediumNumerical valueHas a figure
  6. 9 Apr 2024, Shift 1 · Q71Relative stability of the contributing structures is : (I) CH2=CH−C∥O¨:−H\mathrm{CH_2=CH-\overset{\ddot{O}:}{\overset{\|}{C}}-H} ⟷\longleftrightarrow…MediumSingle correctHas a figure
  7. 9 Apr 2024, Shift 1 · Q89How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects ? [figure: eight…MediumNumerical valueHas a figure
  8. 9 Apr 2024, Shift 2 · Q73The correct stability order of the following resonance structures of CH3−CH=CH−CHO\mathrm{CH_3-CH=CH-CHO} is I:…MediumSingle correctHas a figure
  9. 29 Jan 2024, Shift 1 · Q72The interaction between π\pi bond and lone pair of electrons present on an adjacent atom is responsible forEasySingle correct
  10. 29 Jan 2024, Shift 1 · Q73The difference in energy between the actual structure and the lowest energy resonance structure for the given compound isEasySingle correct
  11. 11 Apr 2023, Shift 1 · Q89[figure: bicyclic (hydrindane-type) skeleton: cyclohexane fused to cyclopentane; Me at the ring-fusion carbon, adjacent cyclopentane…HardNumerical valueHas a figure
  12. 25 Jul 2021, Shift 1 · Q41Which one among the following resonating structures is not correct ?MediumDiagram basedHas a figure
  13. 8 Jan 2020, Shift 1 · Q41Arrange the following compounds in increasing order of C−-OH bond length : methanol, phenol, p-ethoxyphenolMediumSingle correct
  14. 9 Jan 2020, Shift 2 · Q40Which of the following has the shortest C-Cl bond ?MediumSingle correct
  15. 2 Apr 2017 (offline) · Q54Which of the following molecules is least resonance stabilized ?MediumSingle correctHas a figure