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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 6 April 2026, Shift 2, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

Shown below is the structure of methyl acetate with three different α\alpha, β\beta and γ\gamma carbon - oxygen bonds. The correct order of bond lengths of these bonds is :

The figure, in words

Structure of methyl acetate H3C-C(=O)-O-CH3 with the C=O bond labelled alpha, the C-O (acyl carbon to oxygen) bond labelled beta, and the O-CH3 bond labelled gamma.
  1. (1)α>β>γ\alpha>\beta>\gamma
  2. (2)α<β<γ\alpha<\beta<\gammaOfficial answer
  3. (3)α=β=γ\alpha=\beta=\gamma
  4. (4)α<β=γ\alpha<\beta=\gamma

Official answer

Option 2

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Resonance and Hyperconjugation
Idea tested
Mesomeric Effect

Same idea in other shifts

Asked 6× in all
  1. 2 Apr 2026, Shift 2 · Q63Given below are two statements: Statement I: In…MediumSingle correct
  2. 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
  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. 8 Jan 2020, Shift 1 · Q41Arrange the following compounds in increasing order of C−-OH bond length : methanol, phenol, p-ethoxyphenolMediumSingle correct
  5. 9 Jan 2020, Shift 2 · Q40Which of the following has the shortest C-Cl bond ?MediumSingle correct

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.