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Saturday, 31 October

JEE Main 2023 · ChemistryMultiple choiceDiagram basedMediumApplication

JEE Main 13 April 2023, Shift 1, Chemistry Q77

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

In the reaction given below [figure: N-methyl five-membered lactam (N-methylpyrrolidin-2-one)] →(ii) H+(i) NaOH, Δ\xrightarrow[\text{(ii) }H^+]{\text{(i) NaOH, }\Delta} 'A' Major Product 'A' is

The figure, in words

Reactant is N-methyl-2-pyrrolidone (Me on N, ring C=O) treated with (i) NaOH, heat; (ii) H+.
  1. (1)[figure: MeHN-CH2CH2CH2-COOH, zigzag chain ending in COOH]Official answer
  2. (2)[figure: N-methylpyrrolidine ring with gem-diol (two OH) on the carbon next to N]
  3. (3)[figure: N-methyl five-membered ring with C=C and OH on the carbon next to N (enol form)]
  4. (4)[figure: MeHN-CH2CH2CH2-CHO, zigzag chain ending in CHO]

Official answer

Option 1

NTA final key.

Chapter
Amines
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.