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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 3 April 2025, Shift 1, Chemistry Q67

Question 67 of 75 in this shift, Chemistry question 17 of 25, Section A.

The least acidic compound, among the following is: (A) [structure: 3-ethoxyphenol, EtO and OH meta on a benzene ring] (B) [structure: benzenesulfonic acid, C6H5SO3H\mathrm{C_6H_5SO_3H}] (C) [structure: skeletal CH3CH2CH2-COOH (butanoic acid)] (D) [structure: EtO2C−C≡C−H\mathrm{EtO_2C-C\equiv C-H}]

The figure, in words

Four structures A-D: 3-ethoxyphenol; benzenesulfonic acid; a skeletal chain carboxylic acid (-COOH); ethyl propiolate EtO2C-C≡C-H.
  1. (1)B
  2. (2)DOfficial answer
  3. (3)C
  4. (4)A

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Organic Acidity and Basicity
Idea tested
Acidity of Terminal Alkynes

Same topic in other shifts

All Organic Acidity and Basicity questions
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  3. 7 Apr 2025, Shift 1 · Q68Which of the following compounds is least likely to give effervescence of CO2\mathrm{CO_2} in presence of aq. NaHCO3\mathrm{NaHCO_3} ?EasyDiagram basedHas a figure
  4. 8 Apr 2025, Shift 2 · Q61Match the LIST-I with LIST-II LIST-I (Reagent) | LIST-II (Functional Group detected) A. Sodium bicarbonate solution | I. double bond/…MediumMatch the list
  5. 31 Jan 2024, Shift 1 · Q77Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: pKa\mathrm{pK_a} value…EasyAssertion–reason
  6. 28 Jul 2022, Shift 1 · Q74Among the following marked proton of which compound shows lowest pKa\mathrm{pK_a} value ?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 42 of the 174 JEE Main shifts held from 2017 to 2026.