{"knowledge_schema": {"broad_category": "Chemistry \u2192 Stereochemistry \u2192 Optical Activity", "refinement": "This problem involves identifying chiral centers in organic compounds and determining whether they can exist as enantiomers, which exhibit optical activity.", "specific_scope": "The task is to analyze a list of specific organic compounds to assess their chirality and potential for optical activity.", "goal": "Determine how many of the given compounds are chiral and thus capable of exhibiting optical activity."}, "summary": "In this problem, we are tasked with evaluating a list of organic compounds to determine how many exhibit optical activity, which is a characteristic of chiral molecules. A compound is chiral if it has at least one chiral center and does not possess an internal plane of symmetry. By analyzing each compound for chiral centers, we find that three of them are chiral and can exist as enantiomers, thus exhibiting optical activity."}