JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 24 February 2021, Shift 2, Chemistry Q43

Question 43 of 90 in this shift, Chemistry question 13 of 30, Section A.

Which one of the following compounds is non-aromatic ?

The figure, in words

Options are drawn ring structures as described in each option.

(1)[figure: five-membered ring with an O atom at the bottom vertex and two double bonds, one on each side]
(2)[figure: four-membered ring with one double bond on the right side and a $\oplus$ charge marked at each of the two left corners]
(3)[figure: seven-membered ring with three double bonds (top, upper-right/right and left sides) and no substituents]Official answer
(4)[figure: three six-membered rings fused in a row, drawn with alternating double bonds]

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

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.