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Saturday, 31 October

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

Mesomeric Effect

JEE Main asked Mesomeric Effect 9 times in 9 of the 108 shifts Lumi analysed, in 2020, 2024 and 2026. It belongs to Resonance and Hyperconjugation, in Organic Chemistry: Some Basic Principles and Techniques (Chemistry). The longest wait between two years asking it was 4 years. In 2020, 2024 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
9
in 9 shifts
Years
3 of 8
First asked
2020
last in 2026
Pattern
Frequent
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2020, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.150.30’170.25’200’210’220’230.19’240’250.22’26

Raw count: 2017: 0 in 1 shift · 2020: 3 in 12 shifts · 2021: 0 in 24 shifts · 2022: 0 in 24 shifts · 2023: 0 in 12 shifts · 2024: 4 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.

  • 20262 of 9
  • 20250 of 8
  • 20244 of 18
  • 20230 of 12
  • 20220 of 24
  • 20210 of 24
  • 20203 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Single correct is the usual form. Skill tested: conceptual.

  • Statement i/ii on mesomeric effect
  • Order/ranking of bond lengths in a structure

Difficulty

Easy 2Medium 7Hard 0

1 of the 9 questions had a numerical answer.

Every question

All 9 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 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
  2. 2 Apr 2026, Shift 2 · Q63Given below are two statements: Statement I: In…MediumSingle correct
  3. 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
  4. 1 Feb 2024, Shift 2 · Q73The functional group that shows negative resonance effect is :EasySingle correct
  5. 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
  6. 4 Apr 2024, Shift 1 · Q74Match List I with List II : List - I (Mechanism steps) List - II (Effect) (A) [structure: aniline, lone pair on NH2_2 donated into ring,…MediumMatch the listHas a figure
  7. 4 Sep 2020, Shift 2 · Q39Among the following compounds, which one has the shortest C−-Cl bond ?MediumDiagram basedHas a figure
  8. 9 Jan 2020, Shift 2 · Q40Which of the following has the shortest C-Cl bond ?MediumSingle correct
  9. 8 Jan 2020, Shift 1 · Q41Arrange the following compounds in increasing order of C−-OH bond length : methanol, phenol, p-ethoxyphenolMediumSingle correct

Shifts: 8 Jan 2020, Shift 1, 9 Jan 2020, Shift 2, 4 Sep 2020, Shift 2, 29 Jan 2024, Shift 1, 1 Feb 2024, Shift 2, 4 Apr 2024, Shift 1, 9 Apr 2024, Shift 1, 2 Apr 2026, Shift 2, 6 Apr 2026, Shift 2.

Same topic

Other ideas in Resonance and Hyperconjugation

Resonance and Hyperconjugation has 7 ideas JEE Main has asked; 5 of them came up in more than one question.

Topic analysisChapter analysisStudy this chapterAll repeated ideas