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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 3 September 2020, Shift 2, Chemistry Q39

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

The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is : Propanal, Benzaldehyde, Propanone, Butanone
  1. (1)Propanal < Propanone < Butanone < Benzaldehyde
  2. (2)Benzaldehyde < Propanal < Propanone < Butanone
  3. (3)Benzaldehyde < Butanone < Propanone < Propanal
  4. (4)Butanone < Propanone < Benzaldehyde < PropanalOfficial answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Aldehyde vs Ketone Reactivity

Same idea in other shifts

Asked 3× in all
  1. 6 Apr 2024, Shift 1 · Q79Which among the following aldehydes is most reactive towards nucleophilic addition reactions?EasySingle correctHas a figure
  2. 2 Sep 2020, Shift 1 · Q42The increasing order of the following compounds towards HCN addition is : (i) 3-methoxybenzaldehyde (H3CO\mathrm{H_3CO} meta to CHO) (ii)…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.