{"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-substituted products when various aromatic compounds react with bromine, considering the influence of different substituents on the benzene ring.", "goal": "Arrange the given substances based on the expected weight fraction of the yield of the para-isomer from the electrophilic substitution reaction."}, "summary": "This problem requires knowledge of electrophilic aromatic substitution reactions and the influence of substituents on the orientation of these reactions. The substances listed are aromatic compounds with different substituents that affect the formation of para-isomers when reacted with bromine. The goal is to rank these compounds based on the expected yield of the para-isomer, considering the directing effects of the substituents (activating or deactivating) and their positions on the benzene ring."}