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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 25 February 2021, Shift 2, Chemistry Q45

Question 45 of 90 in this shift, Chemistry question 15 of 30, Section A.

The correct order of acid character of the following compounds is : [figure: four benzene-ring compounds labelled I, II, III, IV]

The figure, in words

Four hexagonal benzene rings (alternate double bonds drawn): I has OH on the ring; II has COOH at the top and NO2 at the bottom (opposite positions); III has COOH only; IV has COOH at the top and CH3 at the bottom (opposite positions). Labels I, II, III, IV printed under the structures.
  1. (1)I >> II >> III >> IV
  2. (2)III >> II >> I >> IV
  3. (3)II >> III >> IV >> IOfficial answer
  4. (4)IV >> III >> II >> I

Official answer

Option 3

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Organic Acidity and Basicity
Idea tested
Carboxylic Acid Acidity

Same idea in other shifts

Asked 5× in all
  1. 4 Apr 2026, Shift 2 · Q66The descending order of acidity among the following compounds is: A. phenol B. 4-nitrophenol (O2N\mathrm{O_2N} para to OH on the benzene…MediumOtherHas a figure
  2. 4 Apr 2024, Shift 1 · Q63What will be the decreasing order of basic strength of the following conjugate bases ? O‾H\overline{\mathrm{O}}\mathrm{H},…EasySingle correct
  3. 8 Apr 2024, Shift 2 · Q76The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is : CH3CH2COOH\mathrm{CH_3CH_2COOH},…EasySingle correct
  4. 2 Sep 2020, Shift 2 · Q39Arrange the following labelled hydrogens in decreasing order of acidity :MediumDiagram basedHas 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.