{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Isomerism", "refinement": "This problem focuses on identifying compounds that exhibit optical isomerism, a type of stereoisomerism where molecules can exist as non-superimposable mirror images (enantiomers).", "specific_scope": "The task involves analyzing specific organic compounds to determine which of them possess chiral centers or exhibit optical activity, leading to the possibility of optical isomerism.", "goal": "Identify the correct set of compounds from the given options that show optical isomerism."}, "summary": "This problem involves understanding isomerism in organic chemistry, specifically focusing on optical isomerism. Optical isomers are compounds that can exist as enantiomers due to the presence of chiral centers. The task is to evaluate the provided organic moieties to determine which ones exhibit this property. The goal is to select the correct answer from the given options based on the presence of chiral centers in the compounds."}