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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 3 April 2025, Shift 1, Chemistry Q64

Question 64 of 75 in this shift, Chemistry question 14 of 25, Section A.

Identify the correct statements from the following. A. [structure: pentan-3-one (skeletal, C=O at the middle carbon)] and [structure: pentan-2-one (skeletal, C=O at the second carbon)] are metamers B. [structure: skeletal chain ending in -CN] and [structure: skeletal chain ending in -NC] are functional isomers C. [structure: skeletal chain ending in -OH, unbranched] and [structure: skeletal chain with a methyl branch on the carbon bearing -OH] are position isomers D. [structure: skeletal chain ending in -NH2] and [structure: skeletal secondary amine R-NH-R'] are homologous Choose the correct answer from the options given below:

The figure, in words

Skeletal-formula pairs for statements A-D: A two ketones (C=O in different positions), B nitrile vs isonitrile (-CN / -NC), C an unbranched alcohol vs a methyl-branched alcohol (-OH), D a primary amine (-NH2) vs a secondary amine (-NH-).
  1. (1)A,B & C Only
  2. (2)B & C Only
  3. (3)C & D Only
  4. (4)A & B OnlyOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Structural Isomerism
Idea tested
Metamerism

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2026, Shift 1 · Q64Given below are two statements: Statement I: 2,6-diethylcyclohexanone and 6-methyl-2-n-propylcyclohexanone are metamers. Statement II:…MediumTwo statements

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.