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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceAssertion–reasonEasyConceptual

JEE Main 31 January 2024, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

Given 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 of phenol is 10.0 while that of ethanol is 15.9. Reason R: Ethanol is stronger acid than phenol. In the light of the above statements, choose the correct answer from the options given below:
  1. (1)Both A and R are true and R is the correct explanation of A.
  2. (2)Both A and R are true but R is NOT the correct explanation of A.
  3. (3)A is true but R is false.Official answer
  4. (4)A is false but R is true.

Official answer

Option 3

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Organic Acidity and Basicity
Idea tested
pKa and pKb Analysis

Same topic in other shifts

All Organic Acidity and Basicity questions
  1. 4 Apr 2026, Shift 1 · Q66Amongst the following, the total number of compounds soluble in aqueous NaOH at room temperature is:MediumDiagram basedHas a figure
  2. 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
  3. 3 Apr 2025, Shift 1 · Q67The least acidic compound, among the following is: (A) [structure: 3-ethoxyphenol, EtO and OH meta on a benzene ring] (B) [structure:…MediumDiagram basedHas a figure
  4. 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
  5. 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
  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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.