{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy and Structure Elucidation", "refinement": "This problem involves identifying an organic compound based on spectral data, including mass spectrometry, infrared spectroscopy (IR), and proton nuclear magnetic resonance (1H NMR).", "specific_scope": "The task is to analyze the provided spectral data to deduce the structure of the compound and match it with one of the given candidates.", "goal": "Determine the correct structure of the compound based on the spectral data and select the appropriate candidate from the list."}, "summary": "In this problem, we are tasked with identifying an organic compound using spectral data from mass spectrometry, IR, and 1H NMR. The molecular ion peak at m/z = 180 suggests a molecular weight of 180 g/mol, while the IR peak at 2250 cm^-1 indicates the presence of a nitrile group. The 1H NMR data shows characteristic peaks that suggest a substituted aromatic compound. By analyzing the data, we conclude that the structure corresponds to 4-chlorobenzonitrile, making it the correct candidate from the provided options."}