{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy and Compound Identification", "refinement": "This problem involves analyzing spectral data (mass spectrometry, IR, and NMR) to deduce the structure of an organic compound.", "specific_scope": "The task is to interpret the provided spectral data to identify the most likely structure of a compound with a molecular weight of 180 g/mol and specific spectral characteristics.", "goal": "Determine the correct structure of the compound based on the spectral data provided."}, "summary": "In this problem, we analyze spectral data to identify an organic compound. The mass spectrometry indicates a molecular weight of 180 g/mol, while the IR spectrum suggests the presence of a carboxylic acid functional group. The 1H NMR data reveals specific chemical shifts that correspond to aromatic protons and a singlet indicative of a carboxylic acid. By interpreting this data, we can conclude that the most likely structure of the compound is 4-chlorobenzoic acid, as it fits the molecular weight and spectral characteristics."}