{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Electrophilic Aromatic Substitution", "refinement": "This problem involves understanding the effects of substituents on the reactivity and orientation of electrophilic substitution reactions in aromatic compounds.", "specific_scope": "The focus is on predicting the yield of para-isomers when various substituted benzene compounds react with bromine, considering the directing effects of the substituents.", "goal": "Arrange the given compounds based on the expected yield of para-isomers in the electrophilic substitution reaction with bromine."}, "summary": "In this problem, we analyze how different substituents on a benzene ring influence the yield of para-isomers during electrophilic substitution reactions with bromine. The order of increasing para-isomer yield is determined by the nature of the substituents: electron-withdrawing groups (like -NO2) decrease the yield, while electron-donating groups (like -C2H5 and -CH3) increase it. The final arrangement of compounds based on their para-isomer yields is 4 < 6 < 2 < 1 < 5 < 3."}