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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 30 January 2024, Shift 1, Chemistry Q71

Question 71 of 90 in this shift, Chemistry question 11 of 30, Section A.

Which of the following molecule/species is most stable ?

The figure, in words

All four options are drawn ring structures: six-membered ring with two C=C; five-membered ring with two C=C and + charge; three-membered ring with C=C and lone pair (two dots) on the apex carbon; three-membered ring with C=C and + charge on the apex carbon.
  1. (1)[figure: cyclohexa-1,3-diene ring]
  2. (2)[figure: cyclopentadienyl cation (five-membered ring with two C=C and a + on the top carbon)]
  3. (3)[figure: cyclopropenyl anion (three-membered ring with one C=C and a lone pair on the top carbon)]
  4. (4)[figure: cyclopropenyl cation (three-membered ring with one C=C and a + on the top carbon)]Official answer

Official answer

Option 4

NTA final key.

Chapter
Hydrocarbons
Topic
Aromatic Hydrocarbons
Idea tested
Huckel's Rule (4n+2)

Same idea in other shifts

Asked 8× in all
  1. 8 Apr 2026, Shift 2 · Q64The total number of aromatic compounds/species from the following is [figures: p-benzoquinone; tropylium cation (cycloheptatrienyl…MediumOtherHas a figure
  2. 2 Apr 2025, Shift 1 · Q65Designate whether each of the following compounds is aromatic or not aromatic.MediumSingle correctHas a figure
  3. 8 Apr 2024, Shift 2 · Q88Total number of aromatic compounds among the following compounds is ________.MediumNumerical valueHas a figure
  4. 27 Jan 2024, Shift 1 · Q89Among the given organic compounds, the total number of aromatic compounds is __________. (A) [figure] (B) [figure] (C) [figure] (D) [figure]MediumNumerical valueHas a figure
  5. 13 Apr 2023, Shift 2 · Q74Given below are two statements : Statement I : Tropolone is an aromatic compound and has 8 π\pi electrons. Statement II : π\pi electrons…HardTwo statements
  6. 28 Jun 2022, Shift 1 · Q72Which of the following structures are aromatic in nature ?MediumDiagram basedHas a figure
  7. 17 Mar 2021, Shift 1 · Q42Which of the following is an aromatic compound ?EasyDiagram basedHas 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.