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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceAssertion–reasonMediumApplication

JEE Main 13 April 2023, Shift 2, Chemistry Q76

Question 76 of 90 in this shift, Chemistry question 16 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 : Order of acidic nature of the following compounds is A > B > C. [figure: A = cyclohexane ring with OH and an ortho Cl substituent; B = cyclohexane ring with OH and a para F substituent; C = cyclohexane ring with OH and a meta CH3 substituent] Reason R : Fluoro is a stronger electron withdrawing group than Chloro group. In the light of the above statements, choose the correct answer from the options given below:

The figure, in words

Three hexagon-ring structures each bearing OH: A has Cl on the adjacent (ortho) carbon, B has F on the para carbon, C has CH3 on the meta carbon.
  1. (1)Both A and R are correct and R is the correct explanation of A
  2. (2)Both A and R are correct but R is NOT the correct explanation of AOfficial answer
  3. (3)A is true but R is false
  4. (4)A is false but R is true

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 8× in all
  1. 8 Apr 2024, Shift 2 · Q78Which one the following compounds will readily react with dilute NaOH ?EasySingle correct
  2. 9 Apr 2024, Shift 1 · Q77For 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…MediumSingle correctHas a figure
  3. 27 Jan 2024, Shift 1 · Q74Given below are two statements : Statement (I) : p-nitrophenol is more acidic than m-nitrophenol and o-nitrophenol. Statement (II) :…EasyTwo statements
  4. 6 Apr 2023, Shift 2 · Q78The strongest acid from the following isEasyDiagram basedHas a figure
  5. 25 Jul 2022, Shift 2 · Q75Arrange the following in decreasing acidic strength. (A) [figure: benzene ring with OH and NO2 para to each other] (B) [figure: benzene…EasyDiagram basedHas a figure
  6. 29 Jul 2022, Shift 1 · Q80A compound ‘X’ is acidic and it is soluble in NaOH solution, but insoluble in NaHCO3\mathrm{NaHCO_3} solution. Compound ‘X’ also gives violet…EasyDiagram basedHas a figure
  7. 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 108 of the 174 JEE Main shifts held from 2017 to 2026.