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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceDiagram basedHardConceptual

JEE Main 4 April 2025, Shift 2, Chemistry Q69

Question 69 of 75 in this shift, Chemistry question 19 of 25, Section A.

The correct order of basicity for the following molecules is : [figure: (P) N-methylpiperidin-2-one; (Q) N-methyl-5,6-dihydropyridin-2(1H)-one with a ring C=C; (R) bridged bicyclic lactam (N at bridgehead, C=O adjacent)]

The figure, in words

Three lactams: (P) N-methyl six-membered lactam (N-methylpiperidin-2-one); (Q) same N-methyl six-membered lactam with a C=C in the ring; (R) bridged bicyclic lactam with the N at the bridgehead and the C=O adjacent to N.
  1. (1)P>Q>RP>Q>R
  2. (2)Q>P>RQ>P>R
  3. (3)R>Q>PR>Q>POfficial answer
  4. (4)R>P>QR>P>Q

Official answer

Option 3

NTA final key.

Chapter
Amines
Topic
Amines
Idea tested
Basicity of Amides vs Amines

Same idea in other shifts

Asked 2× in all
  1. 16 Mar 2021, Shift 2 · Q47Which of the following is least basic ?EasySingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.