CBSE 2025 · Region 2 · Set 2 · Q17 · 1 mark
Assertion (A) : Propanal and propanone are structural isomers.
Reason (R) : Propanal and propanone both have the same molecular formula.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Carbon and its CompoundsNomenclature of Carbon CompoundsUnderstandassertion_reasonmedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.