{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reaction Mechanisms", "refinement": "This problem involves understanding the reactions of organic compounds, specifically the decolorization of bromine water and hydrogenation processes.", "specific_scope": "The focus is on the transformation of two liquid blends through reactions with platinum, leading to the formation of a hydrocarbon with a specific hydrogen mass fraction.", "goal": "Determine the molecular formula of the hydrocarbon C based on the given hydrogen mass fraction and the context of the reactions."}, "summary": "This problem is rooted in organic chemistry, specifically in the reactions of liquid blends with platinum and the resulting transformations. It describes how an equimolar blend of two liquids that can decolorize bromine water reacts to form a new blend that cannot, followed by hydrogenation to yield a hydrocarbon. The key is to analyze the hydrogen mass fraction of the resulting hydrocarbon, which is given as 14.28%. The task is to deduce the molecular formula of the hydrocarbon C, leading to the conclusion that the answer is 18."}