{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Isomerism", "refinement": "This problem focuses on the classification of isomers, specifically identifying compounds that exhibit tautomerism and optical isomerism.", "specific_scope": "The task involves determining which compound does not show tautomerism and which compound exhibits optical isomerism among the given options.", "goal": "Identify the correct pairs of compounds based on their isomeric properties."}, "summary": "This problem involves understanding isomerism in organic chemistry, specifically distinguishing between tautomerism and optical isomerism. The task is to identify which compound among benzoquinone and cyclohexane-1,3,5-trione does not exhibit tautomerism, and which compound between methyl 2-hydroxypropanoate and dimethyl fumarate shows optical isomerism. The correct answer is that benzoquinone does not show tautomerism, and methyl 2-hydroxypropanoate exhibits optical isomerism."}