{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy", "refinement": "This problem involves interpreting 1H NMR (proton nuclear magnetic resonance) data to identify the structure of an organic compound.", "specific_scope": "The focus is on analyzing the chemical shifts, splitting patterns, and integration of the NMR signals to distinguish between isomeric compounds.", "goal": "Identify the unknown organic compound based on the provided 1H NMR data and match it to one of the given candidates."}, "summary": "In this problem, we analyze 1H NMR data to identify an unknown organic compound among four candidates. The chemical shifts and splitting patterns provide clues about the structure, specifically regarding the presence of double bonds and the arrangement of substituents. By interpreting the NMR signals, we conclude that the unknown compound is Trans-2-butenyl acetate, as indicated by the specific chemical shifts and splitting patterns consistent with this structure."}