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ChemistryJEE Main 23 Jan 2026, Shift 2·Q25·Numerical·Moderate

Aldehydes, Ketones & Acids · Intramolecular aldol condensation

In compound (Q), the percentage of oxygen is %. (Nearest integer)
We corrected a printing error in the original paper

Answer supplied; the source prints no answer key for this question (its worked solution gives 10.19%; Q = 3-phenylcyclopent-2-en-1-one, CX11HX10O\ce{C11H10O}, 16/158 = 10.1%).

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