{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy", "refinement": "This problem involves interpreting 1H NMR (nuclear magnetic resonance) spectroscopy data to identify a compound based on its molecular formula and spectral signals.", "specific_scope": "The focus is on analyzing the chemical shifts and splitting patterns in the 1H NMR spectrum to deduce the structure of the compound with the formula C9H10O.", "goal": "Identify the correct compound from the given candidates based on the provided NMR signals."}, "summary": "This problem requires understanding how to interpret 1H NMR spectroscopy data to identify an organic compound. The molecular formula C9H10O and the specific NMR signals\u2014a singlet at 9.8 ppm, a multiplet at 7.2-7.4 ppm, and a singlet at 2.4 ppm\u2014suggest the presence of a benzaldehyde structure. The singlet at 9.8 ppm indicates an aldehyde proton, while the multiplet in the aromatic region corresponds to protons on a benzene ring, confirming that the compound is benzaldehyde."}