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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 9 April 2024, Shift 1, Chemistry Q77

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

For the given compounds, the correct order of increasing pKa\mathrm{pK_a} value : (A) phenol (B) 4-nitrophenol (O2N\mathrm{O_2N} and OH para on benzene ring) (C) 3-methoxyphenol (HO and OCH3\mathrm{OCH_3} meta) (D) 3-nitrophenol (OH and NO2\mathrm{NO_2} meta) (E) 4-methoxyphenol (HO and OCH3\mathrm{OCH_3} para) Choose the correct answer from the options given below :

The figure, in words

Five substituted benzene rings: (A) phenol (OH); (B) O2N para to OH; (C) HO and OCH3 meta; (D) OH and NO2 meta; (E) HO and OCH3 para.
  1. (1)(E) < (D) < (C) < (B) < (A)
  2. (2)(E) < (D) < (B) < (A) < (C)
  3. (3)(B) < (D) < (A) < (C) < (E)Official answer
  4. (4)(D) < (E) < (C) < (B) < (A)

Official answer

Option 3

NTA final key.

Chapter
Alcohols, Phenols and Ethers
Topic
Alcohols and Phenols
Idea tested
Phenol Acidity Comparison

Same idea in other shifts

Asked 3× in all
  1. 13 Apr 2023, Shift 2 · Q76Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Order of acidic nature…MediumAssertion–reasonHas a figure
  2. 29 Jun 2022, Shift 1 · Q80Given below are two statements. Statement I : Phenols are weakly acidic. Statement II : Therefore they are freely soluble in NaOH solution…EasyTwo statements

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.