{"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 aromatic compounds in order of increasing weight fraction of the yield of the para-isomer after bromination."}, "summary": "This problem requires knowledge of electrophilic aromatic substitution reactions and the influence of substituents on the orientation of these reactions. The task is to evaluate how different substituents on a benzene ring affect the formation of para-isomers when treated with bromine. The correct arrangement of the substances based on the yield of para-isomers is crucial for understanding the reactivity patterns of substituted aromatic compounds."}