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Friday, 9 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 8 April 2023, Shift 2, Chemistry Q73

Question 73 of 90 in this shift, Chemistry question 13 of 30, Section A.

The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is : A. [chlorobenzene] B. [1-chloro-2-nitrobenzene (NO2_2 ortho to Cl)] C. [1-chloro-2-methoxybenzene (OMe ortho to Cl)] D. [1-chloro-2,4,6-trinitrobenzene (NO2_2 at both ortho positions and para)] Choose the correct answer from the options given below:

The figure, in words

Four benzene rings: A chlorobenzene; B Cl with ortho NO2; C Cl with ortho OMe; D Cl with two ortho NO2 and one para NO2
  1. (1)A > B > D > C
  2. (2)C > A > D > B
  3. (3)D > C > B > A
  4. (4)D > B > A > COfficial answer

Official answer

Option 4

NTA final key.

Chapter
Haloalkanes and Haloarenes
Topic
Aromatic Hydrocarbons
Idea tested
SNAr and Meisenheimer Complex

Same idea in other shifts

Asked 3× in all
  1. 31 Jan 2024, Shift 2 · Q76Identify A and B in the following reaction sequence. [reaction: bromobenzene --(Conc HNO3_3)--> A --((i) NaOH, (ii) HCl)--> B]HardDiagram basedHas a figure
  2. 3 Aug 2021, Shift 2 · Q43Order of reactivity for hydrolysis of substituted chlorobenzenes in the presence of aqueous NaOH isMediumSingle 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.