{"knowledge_schema": {"broad_category": "Chemistry \u2192 Stereochemistry \u2192 Optical Isomerism", "refinement": "Optical isomerism occurs in compounds that have chiral centers, meaning they cannot be superimposed on their mirror images.", "specific_scope": "The focus is on identifying which of the given compounds has chiral centers that allow for the existence of enantiomers.", "goal": "Determine which compound among the candidates can exhibit optical isomerism based on its structural features."}, "summary": "This question pertains to the concept of optical isomerism in chemistry, which is a type of stereoisomerism where compounds have chiral centers and can exist as non-superimposable mirror images (enantiomers). The task is to analyze the provided compounds to identify which one possesses the necessary structural characteristics to exhibit optical isomerism. The correct answer is dimethyl 6,6'-dinitro-[1,1'-biphenyl]-2,2'-dicarboxylate, as it contains chiral centers that allow for optical isomerism."}