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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceDiagram basedEasyConceptual

JEE Main 27 January 2024, Shift 1, Chemistry Q77

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

Which of the following is strongest Bronsted base ?

The figure, in words

Four structures: aniline; diphenylamine; pyrrolidine (saturated 5-ring NH); pyrrole (5-ring with two double bonds, N-H, lone pair dots on N).
  1. (1)[figure: aniline, benzene ring with NH2\mathrm{NH_2}]
  2. (2)[figure: diphenylamine, two benzene rings joined through NH]
  3. (3)[figure: pyrrolidine, saturated five-membered ring with N-H]Official answer
  4. (4)[figure: pyrrole, five-membered ring with two C=C and N-H with lone pair shown]

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Amines
Idea tested
Basicity of Nitrogen Heterocycles

Same idea in other shifts

Asked 5× in all
  1. 9 Apr 2024, Shift 1 · Q78Correct order of basic strength of Pyrrole (five-membered ring with NH), Pyridine (six-membered aromatic ring with N) and Piperidine…MediumSingle correctHas a figure
  2. 4 Aug 2021, Shift 2 · Q46For the compounds below given [structures I, II, III, IV: see figure_note] the correct order of basicity isMediumDiagram basedHas a figure
  3. 9 Jan 2020, Shift 2 · Q39The decreasing order of basicity of the following amines is :MediumSingle correctHas a figure
  4. 5 Sep 2020, Shift 1 · Q27The increasing order of basicity of the following compounds is :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.