JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 25 July 2021, Shift 2, Chemistry Q42

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

Which among the following is the strongest acid ?

The figure, in words

All four options are drawn structures except option 3 which is printed text. Option 1: benzene-type ring with a single-line substituent at one vertex. Option 2: triangle with one double bond on the bottom edge. Option 4: five-membered ring with two double bonds.

(1)[figure: a six-membered ring drawn as a benzene ring with alternating double bonds and a single line substituent from the upper-right vertex]
(2)[figure: a three-membered ring (triangle) with one double bond drawn on the bottom edge]
(3) $\mathrm{CH_3CH_2CH_2CH_3}$
(4)[figure: a five-membered ring with two double bonds, drawn on the upper-left and upper-right edges]Official answer

Official answer

Option 4

NTA final key.

Chapter: Organic Chemistry: Some Basic Principles and Techniques
Topic: Organic Acidity and Basicity
Idea tested: Aromaticity-Driven Carbon Acidity

Same topic in other shifts

All Organic Acidity and Basicity questions

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.