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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 27 June 2022, Shift 2, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

Which of the following is most stable?

The figure, in words

All four options are drawn structures: A cyclic three-membered ring with C=C and a circled plus; B the same ring with a small circle containing two dots (no minus line drawn) on the top atom; C five-membered ring with two double bonds and a circled plus; D six-membered ring with two double bonds.
  1. (1)[figure: three-membered ring (triangle) with a double bond drawn along its base and a circled plus sign on the top atom]Official answer
  2. (2)[figure: three-membered ring (triangle) with a double bond drawn along its base and a small circle containing two dots (no minus line drawn) on the top atom]
  3. (3)[figure: five-membered ring with two double bonds and a circled plus sign on the top atom]
  4. (4)[figure: six-membered ring with two double bonds, no charge]

Official answer

Option 1

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Resonance and Hyperconjugation
Idea tested
Huckel's Rule

Same idea in other shifts

Asked 7× in all
  1. 12 Apr 2023, Shift 1 · Q74Correct statements for the given reaction are : [figure: 'A' -> 'B' with OH−^- (2eq)] A. Compound 'B' is aromatic B. The completion of…MediumOtherHas a figure
  2. 30 Jul 2022, Shift 2 · Q43Which of the following is unstable?MediumDiagram basedHas a figure
  3. 26 Aug 2021, Shift 2 · Q42Which one of the following compounds is not aromatic ?MediumDiagram basedHas a figure
  4. 24 Feb 2021, Shift 2 · Q43Which one of the following compounds is non-aromatic ?EasySingle correctHas a figure
  5. 8 Jan 2020, Shift 2 · Q41The major product in the following reaction is : [figure] + H3O⊕⟶+\ \mathrm{H_3O^{\oplus}} \longrightarrowMediumDiagram basedHas a figure
  6. 2 Apr 2017 (offline) · Q54Which of the following molecules is least resonance stabilized ?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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.