{"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, and nuclear magnetic resonance (NMR) spectroscopy.", "specific_scope": "The task is to analyze the provided spectral data to deduce the structure of the compound and determine which of the given candidates matches the data.", "goal": "Identify the correct structure of the compound based on the spectral data provided."}, "summary": "In this problem, we are tasked with identifying an organic compound using spectral data from mass spectrometry, IR, and 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 NMR data shows aromatic protons and a singlet indicating a methyl group. Analyzing these data points leads us to conclude that the compound is likely 4-chlorobenzonitrile, as it fits the molecular weight and spectral characteristics provided."}