{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reactions of Carbonyl Compounds", "refinement": "This problem involves the reaction of diketones formed from specific ketones when treated with hydrochloric acid and sodium nitrite.", "specific_scope": "The focus is on identifying the correct starting materials (ketones) that will yield the specified diketones upon treatment with the reagents.", "goal": "Select the appropriate starting materials C and D that will produce the desired diketones through the specified reaction."}, "summary": "In this problem, we are tasked with identifying the correct starting materials that will yield specific diketones when treated with hydrochloric acid and sodium nitrite. The reactions involve carbonyl compounds, and the goal is to match the starting materials to the resulting diketones. The correct answer is that C is 3-ethylcyclopentan-1-one and D is 4-methylpentan-2-one, as these compounds will produce the specified diketones upon treatment."}