{"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 from a series of aromatic compounds when reacted with bromine.", "goal": "Arrange the given substances based on the expected weight fraction of the yield of the para-isomer after electrophilic substitution."}, "summary": "This problem requires knowledge of electrophilic aromatic substitution and the influence of different substituents on the orientation of the reaction. The substances listed are aromatic compounds with various substituents that can either direct electrophiles to the ortho or para positions or affect the overall yield of the para isomer. The goal is to rank these compounds based on the expected yield of the para-isomer when treated with bromine, considering the directing effects of the substituents."}