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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 26 August 2021, Shift 2, Chemistry Q42

Question 42 of 90 in this shift, Chemistry question 12 of 30, Section A.

Which one of the following compounds is not aromatic ?

The figure, in words

All four options are drawn structures; described in the option texts. No labels printed on the rings.
  1. (1)[figure: five-membered ring with two C=C double bonds drawn; the ring atom at the bottom carries two dots (lone pair) and a circled minus sign]
  2. (2)[figure: eight-membered ring with four C=C double bonds drawn]Official answer
  3. (3)[figure: seven-membered ring with three C=C double bonds drawn; the ring atom at the bottom carries a circled plus sign]
  4. (4)[figure: benzene ring (three double bonds drawn) with an O atom attached, the O showing two pairs of dots and bonded to H]

Official answer

Option 2

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