{"knowledge_schema": {"broad_category": "Chemistry \u2192 Spectroscopy \u2192 NMR Spectroscopy", "refinement": "This problem involves interpreting 1H NMR spectra to identify the components of a mixture based on chemical shifts and integration ratios.", "specific_scope": "The focus is on analyzing the signals in the NMR spectrum of a 1:1 mixture of two aromatic compounds with the formula C10H14, specifically looking at the singlet signals and their ratios.", "goal": "Determine the identity of the two aromatic compounds in the mixture based on the provided NMR data."}, "summary": "In this problem, we analyze a 1H NMR spectrum of a 1:1 mixture of two aromatic compounds, C10H14, which shows specific singlet signals. The presence of two singlet signals at approximately 6.7 ppm in a 1:1 ratio indicates that both compounds contribute equally to this region, likely due to similar aromatic environments. The three singlet signals around 2.2 ppm in a 2:1:1 ratio suggest different types of protons in the aliphatic region. By evaluating the candidates, the correct answer is determined to be 1,2,4,5-tetramethylbenzene and 1,2,3,4-tetramethylbenzene, as they fit the observed NMR characteristics."}