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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 27 January 2024, Shift 1, Chemistry Q75

Question 75 of 90 in this shift, Chemistry question 15 of 30, Section A.

The ascending order of acidity of −-OH group in the following compounds is : (A) Bu−-OH (B) [p-nitrophenol: O2N\mathrm{O_2N} at para position of phenol] (C) [p-methoxyphenol: MeO at para position of phenol] (D) [phenol] (E) [2,4-dinitrophenol: O2N\mathrm{O_2N} para and NO2\mathrm{NO_2} ortho to OH] Choose the correct answer from the options given below :

The figure, in words

(A) Bu-OH; (B) benzene ring with O2N at one end and OH at the opposite (para) position; (C) ring with MeO para to OH; (D) phenol; (E) ring with O2N para to OH and a second NO2 at the ortho position relative to OH (drawn lower right, i.e. 2,4-dinitrophenol). Note: in the drawing the lower NO2 is attached on the carbon adjacent to the OH carbon.
  1. (1)(A) < (C) < (D) < (B) < (E)Official answer
  2. (2)(C) < (D) < (B) < (A) < (E)
  3. (3)(A) < (D) < (C) < (B) < (E)
  4. (4)(C) < (A) < (D) < (B) < (E)

Official answer

Option 1

NTA final key.

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

Same idea in other shifts

Asked 2× in all
  1. 10 Apr 2023, Shift 2 · Q76The correct order for acidity of the following hydroxyl compound is : A. CH3OH\mathrm{CH_3OH} B. (CH3)3COH\mathrm{(CH_3)_3COH} C. phenol…MediumOtherHas 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.