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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 8 April 2024, Shift 2, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 of 30, Section A.

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is : CH3CH2COOH\mathrm{CH_3CH_2COOH}, CH3COOH\mathrm{CH_3COOH}, CH3CH2CH2COOH\mathrm{CH_3CH_2CH_2COOH}, HCOOH\mathrm{HCOOH}
  1. (1)CH3CH2CH2COOH>CH3CH2COOH>CH3COOH>HCOOH\mathrm{CH_3CH_2CH_2COOH > CH_3CH_2COOH > CH_3COOH > HCOOH}
  2. (2)HCOOH>CH3COOH>CH3CH2COOH>CH3CH2CH2COOH\mathrm{HCOOH > CH_3COOH > CH_3CH_2COOH > CH_3CH_2CH_2COOH}Official answer
  3. (3)HCOOH>CH3CH2CH2COOH>CH3CH2COOH>CH3COOH\mathrm{HCOOH > CH_3CH_2CH_2COOH > CH_3CH_2COOH > CH_3COOH}
  4. (4)CH3COOH>CH3CH2COOH>CH3CH2CH2COOH>HCOOH\mathrm{CH_3COOH > CH_3CH_2COOH > CH_3CH_2CH_2COOH > HCOOH}

Official answer

Option 2

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
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. 25 Feb 2021, Shift 2 · Q45The correct order of acid character of the following compounds is : [figure: four benzene-ring compounds labelled I, II, III, IV]MediumDiagram basedHas a figure
  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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.