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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 30 July 2022, Shift 2, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

Which of the following is unstable?

The figure, in words

Options A-D are ring drawings only; no atom labels or charges legible except an unclear small mark at the top vertex of the five-membered ring in B.
  1. (1)[figure: four-membered ring (square) with two double bonds, drawn as two inner vertical lines parallel to the left and right sides]Official answer
  2. (2)[figure: five-membered ring with two double bonds; an unclear small mark at the top vertex]
  3. (3)[figure: seven-membered ring with three double bonds]
  4. (4)[figure: six-membered ring with three alternating double bonds]

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. 27 Jun 2022, Shift 2 · Q72Which of the following is most stable?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.