Class JEE Chemistry ALL Q #1191
KNOWLEDGE BASED
APPLY
4 Marks 2026 JEE Main 2026 (Online) 21st January Morning Shift MCQ SINGLE
Consider the following statements: (A) Propanal and propanone are functional isomers; (B) Ethoxyethane and methoxypropane are metamers; (C) But-2-ene shows optical isomerism; (D) But-1-ene and but-2-ene are functional isomers; (E) Pentane and 2,2-dimethylpropane are chain isomers. The correct statements are:
(A) A, B, D only
(B) B, C, D only
(C) A, B, E only
(D) A, B, D, E only
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Step-by-Step Solution

  1. Statement A: Propanal (aldehyde) and propanone (ketone) have the same molecular formula (C3H6O) but different functional groups. Thus, they are functional isomers. This statement is correct.
  2. Statement B: Ethoxyethane (C2H5OC2H5) and methoxypropane (CH3OC3H7) have the same molecular formula (C4H10O) but different alkyl groups attached to the oxygen atom. Thus, they are metamers. This statement is correct.
  3. Statement C: But-2-ene (CH3CH=CHCH3) does not show optical isomerism because it lacks a chiral carbon. It exhibits geometrical isomerism (cis-trans). This statement is incorrect.
  4. Statement D: But-1-ene (CH2=CHCH2CH3) and but-2-ene (CH3CH=CHCH3) have the same molecular formula (C4H8) but different positions of the double bond. They are position isomers, not functional isomers. This statement is incorrect.
  5. Statement E: Pentane (CH3CH2CH2CH2CH3) and 2,2-dimethylpropane (CH3C(CH3)2CH3) have the same molecular formula (C5H12) but different arrangements of the carbon chain. Thus, they are chain isomers. This statement is correct.

Therefore, the correct statements are A, B, and E.

Correct Answer: A, B, E only

AI Suggestion: Option C

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student needs to apply their knowledge of isomerism to identify the correct statements.
Knowledge Dimension: CONCEPTUAL
Justification: The question requires understanding of the concepts of functional isomers, metamers, optical isomerism, and chain isomers.
Syllabus Audit: In the context of JEE, this is classified as KNOWLEDGE. The question directly tests the understanding and application of isomerism concepts, which are part of the standard JEE syllabus.

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