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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 9 January 2020, Shift 2, Chemistry Q39

Question 39 of 75 in this shift, Chemistry question 14 of 25, Section A.

The decreasing order of basicity of the following amines is :

The figure, in words

Four structures drawn: (I) aniline (benzene ring with NH2), (II) pyridine, (III) cyclohexylamine (cyclohexane ring with NH2), (IV) pyrrole (five-membered ring with N-H).
  1. (1)(III) > (II) > (I) > (IV)Official answer
  2. (2)(III) > (I) > (II) > (IV)
  3. (3)(II) > (III) > (IV) > (I)
  4. (4)(I) > (III) > (IV) > (II)

Official answer

Option 1

NTA final key (Jan 2020).

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. 27 Jan 2024, Shift 1 · Q77Which of the following is strongest Bronsted base ?EasyDiagram basedHas a figure
  3. 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
  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.