{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy and Reaction Mechanisms", "refinement": "This problem involves interpreting NMR data to deduce the structure of organic compounds and understanding reaction sequences including nitration, reduction, diazotization, and coupling reactions.", "specific_scope": "The focus is on identifying the final product (compound W) after a series of transformations starting from compound X, based on its NMR characteristics and subsequent reactions.", "goal": "Determine the structure of compound W based on the provided information about the starting compound and the reactions it undergoes."}, "summary": "This problem requires knowledge of organic chemistry, particularly in interpreting NMR spectra and understanding reaction mechanisms. Compound X, identified through its NMR signals, undergoes nitration to form compound Y, which is then reduced to compound Z. Following diazotization and coupling with phenol, the final product, compound W, is formed. The goal is to identify compound W from the given options, which is determined to be 4-hydroxyazobenzene based on the reaction pathway and the structure of the starting materials."}