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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 8 January 2020, Shift 2, Chemistry Q41

Question 41 of 75 in this shift, Chemistry question 16 of 25, Section A.

The major product in the following reaction is : [figure] + H3O⊕⟶+\ \mathrm{H_3O^{\oplus}} \longrightarrow

The figure, in words

Reactant drawn: three-membered ring with a double-bonded O on the top ring atom, a double bond along the bottom edge of the ring, and CH3 attached to the lower right ring atom; followed by '+ H3O (circled plus)' and a reaction arrow.
  1. (1)[figure: three-membered ring; the top ring atom carries a double-bonded O; the lower right ring atom carries OH and CH3; no ring double bond]
  2. (2)[figure: three-membered ring; the top ring atom carries two OH; a double bond is drawn along the bottom edge of the ring; CH3 on the lower right ring atom]
  3. (3)[figure: three-membered ring with all single bonds; the top ring atom carries a double-bonded O; HO on the lower left ring atom; CH3 on the lower right ring atom]
  4. (4)[figure: three-membered ring; the top ring atom carries OH and a circled plus charge; a double bond is drawn along the bottom edge of the ring; CH3 on the lower right ring atom]Official answer

Official answer

Option 4

NTA final key (Jan 2020).

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. 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.