Learn

Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 3 September 2020, Shift 1, Chemistry Q39

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

Which one of the following compounds possesses the most acidic hydrogen ?

The figure, in words

Options 2, 3 and 4 are drawn structures (described in the option text); option 1 is printed as a line formula.
  1. (1)H3C−C≡C−H\mathrm{H_3C-C\equiv C-H}
  2. (2)[figure: drawn structure with a central carbon double-bonded to O, with H3C on one side and CH3 on the other, as labelled in the drawing]
  3. (3)[figure: drawn structure with a central carbon bearing two H, bonded on one side to a carbon labelled N≡C and on the other side to C≡N, as drawn]
  4. (4)[figure: drawn structure with a central carbon bearing H, bonded to three carbons each double-bonded to O; the three carbons carry the labels MeO, OMe and OMe respectively, as drawn]Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Organic Acidity and Basicity
Idea tested
Acidity of Active Methylene Compounds

Same idea in other shifts

Asked 2× in all
  1. 27 Jan 2024, Shift 1 · Q72Which of the following has highly acidic hydrogen ?EasyDiagram 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.