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Saturday, 31 October

JEE Main 2022 · ChemistryMultiple choiceDiagram basedHardConceptual

JEE Main 26 June 2022, Shift 1, Chemistry Q77

Question 77 of 90 in this shift, Chemistry question 17 of 30, Section A.

Among the following structures, which will show the most stable enamine formation ? (Where Me is −CH3-\mathrm{CH_3})

The figure, in words

Four drawn enamine structures on a ring with N and a wedge-bonded COOH; they differ in the position of Me and OMe on the C=C.
  1. (1)[structure: six-membered ring containing N, with a COOH on a wedge bond at the ring carbon next to N; N bonded to a C=C unit, the carbon on N bearing Me (lower left) and the other alkene carbon bearing OMe (lower right)]
  2. (2)[structure: same ring, COOH on wedge; N bonded to a C=C unit, the carbon on N bearing Me (lower left) and the other alkene carbon bearing OMe (upper right)]
  3. (3)[structure: same ring, COOH on wedge; N bonded to a C=C unit, the carbon on N bearing Me (lower right) and the other alkene carbon bearing OMe (lower left)]Official answer
  4. (4)[structure: same ring, COOH on wedge; N bonded to a C=C unit, the carbon on N bearing Me (lower right) and the other alkene carbon bearing MeO (left)]

Official answer

Option 3

NTA final key.

Chapter
Amines
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.