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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 3 August 2021, Shift 1, Chemistry Q44

Question 44 of 90 in this shift, Chemistry question 14 of 30, Section A.

The correct arrangement of the following compounds in the order of increasing difficulty towards nucleophilic substitution is

The figure, in words

Four benzene rings drawn, each with Cl at the top: I has NO2 at the ortho position (upper right) and NO2 at the para position (bottom); II has NO2 at the meta position (lower right); III has CH3 at the para position (bottom); IV has NO2 at the para position (bottom). Labelled I, II, III, IV below.
  1. (1)I, II, IV, III
  2. (2)IV, III, I, II
  3. (3)I, II, III, IV
  4. (4)I, IV, II, IIIOfficial 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 5× 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. 8 Apr 2023, Shift 2 · Q73The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is : A. [chlorobenzene] B.…MediumSingle correctHas a figure
  3. 3 Aug 2021, Shift 2 · Q43Order of reactivity for hydrolysis of substituted chlorobenzenes in the presence of aqueous NaOH isMediumSingle correctHas a figure
  4. 24 Feb 2021, Shift 2 · Q45The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is : (i) [figure:…MediumDiagram basedHas 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.