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Saturday, 31 October

JEE Main 2017 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 2 April 2017 (offline), Chemistry Q54

Question 54 of 90 in this shift, Chemistry question 24 of 30.

Which of the following molecules is least resonance stabilized ?

The figure, in words

Four ring structures: pyridine, 4,4-dimethylcyclohexa-2,5-dienone, benzene, furan.
  1. (1)[structure: pyridine]
  2. (2)[structure: 4,4-dimethylcyclohexa-2,5-dien-1-one (ring with C=O and gem-dimethyl)]Official answer
  3. (3)[structure: benzene]
  4. (4)[structure: furan]

Official answer

Option 2

CBSE answer key (25/04/2017, used for result).

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. 26 Aug 2021, Shift 2 · Q42Which one of the following compounds is not aromatic ?MediumDiagram basedHas a figure
  5. 24 Feb 2021, Shift 2 · Q43Which one of the following compounds is non-aromatic ?EasySingle correctHas a figure
  6. 8 Jan 2020, Shift 2 · Q41The major product in the following reaction is : [figure] + H3O⊕⟶+\ \mathrm{H_3O^{\oplus}} \longrightarrowMediumDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); 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.