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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceTwo statementsMediumConceptual

JEE Main 4 April 2024, Shift 1, Chemistry Q78

Question 78 of 90 in this shift, Chemistry question 18 of 30, Section A.

Given below are two statements : Statements I : Acidity of α\alpha-hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both Statement I and Statement II are correct
  2. (2)Both Statement I and Statement II are incorrect
  3. (3)Statement I is correct but Statement II is incorrectOfficial answer
  4. (4)Statement I is incorrect but Statement II is correct

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Aldol and Cannizzaro
Idea tested
Cross-Aldol Condensation

Same idea in other shifts

Asked 3× in all
  1. 28 Jun 2022, Shift 2 · Q76Isobutyraldehyde on reaction with formaldehyde and K2CO3\mathrm{K_2CO_3} gives compound ‘A’. Compound ‘A’ reacts with KCN and yields compound…HardDiagram basedHas a figure
  2. 25 Jul 2021, Shift 1 · Q44[figure: 3,3-dimethylcyclopentanone (ketone C=O, gem-dimethyl on adjacent ring carbon) reacts with CH3CHO\mathrm{CH_3CHO}, NaOH to give 'P'…HardSingle correctHas 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.