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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 25 June 2022, Shift 2, Chemistry Q79

Question 79 of 90 in this shift, Chemistry question 19 of 30, Section A.

Which of the following ketone will NOT give enamine on treatment with secondary amines? [where t-Bu is –C(CH3_3)3_3]

The figure, in words

Options are drawn ketones: two acyclic with C2H5/C2H5 and C2H5/CH3, one with two t-Bu groups, one a six-membered ring with =O.
  1. (1)[figure: carbonyl C (C=O) with C2H5\mathrm{C_2H_5} at lower left and C2H5\mathrm{C_2H_5} at lower right]
  2. (2)[figure: carbonyl C (C=O) with C2H5\mathrm{C_2H_5} at lower left and CH3\mathrm{CH_3} at lower right]
  3. (3)[figure: carbonyl C (C=O) with t-Bu at lower left and t-Bu at lower right]Official answer
  4. (4)[figure: six-membered carbocyclic ring with an O (carbonyl) drawn at the top ring carbon]

Official answer

Option 3

NTA final key.

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Enamine Formation

Same topic in other shifts

All Nucleophilic Addition questions
  1. 2 Apr 2026, Shift 2 · Q67A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q66Given below are two statements : Statement I : The condensation reaction between CH3−CH=O\mathrm{CH_3-CH=O} and H2N−NH−C(=O)−NH2\mathrm{H_2N-NH-C(=O)-NH_2}…MediumTwo statements
  3. 7 Apr 2025, Shift 2 · Q68"P" is an optically active compound with molecular formula C6H12O\mathrm{C_6H_{12}O}. When 'P' is treated with 2, 4-dinitrophenylhydrazine, it…MediumDiagram basedHas a figure
  4. 6 Apr 2024, Shift 1 · Q79Which among the following aldehydes is most reactive towards nucleophilic addition reactions?EasySingle correctHas a figure
  5. 6 Apr 2024, Shift 2 · Q78Consider the given reaction, identify the major product P. CH3−COOH\mathrm{CH_3-COOH}…MediumSingle correct
  6. 30 Jan 2024, Shift 1 · Q90The compound formed by the reaction of ethanal with semicarbazide contains ________ number of nitrogen atoms.EasyNumerical value

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.