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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 12 April 2023, Shift 1, Chemistry Q74

Question 74 of 90 in this shift, Chemistry question 14 of 30, Section A.

Correct statements for the given reaction are : [figure: 'A' -> 'B' with OH−^- (2eq)] A. Compound 'B' is aromatic B. The completion of above reaction is very slow C. 'A' shows tautomerism D. The bond lengths of C-C in compound B are found to be same Choose the correct answer from the options given below:

The figure, in words

Compound A is a four-membered carbocyclic ring (cyclobutene) with two C=O groups on the left side (top-left and bottom-left carbons) and two C-OH groups on the right side (top-right and bottom-right carbons) joined by a C=C double bond; labelled 'A'. Arrow with reagent OH- (2eq) gives 'B'.
  1. (1)A, B and C only
  2. (2)B, C and D only
  3. (3)A, C and D onlyOfficial answer
  4. (4)A, B and D only

Official answer

Option 3

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. 30 Jul 2022, Shift 2 · Q43Which of the following is unstable?MediumDiagram basedHas 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.