{"knowledge_schema": {"broad_category": "Chemistry \u2192 Stereochemistry \u2192 Chirality", "refinement": "This problem focuses on identifying compounds that possess chiral centers, which are responsible for the ability to rotate plane-polarized light.", "specific_scope": "The task is to evaluate a list of compounds to determine which one has a chiral center, making it optically active.", "goal": "Identify the compound among the candidates that can rotate plane-polarized light due to the presence of a chiral center."}, "summary": "This problem involves the concept of chirality in chemistry, specifically identifying which compounds can rotate plane-polarized light. A chiral center is a carbon atom bonded to four different substituents, leading to optical activity. Among the given candidates, ethyl 2-chloropropanoate is the only compound that contains a chiral center, making it capable of rotating plane-polarized light, while the other compounds do not possess this characteristic."}