{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reaction Mechanisms", "refinement": "This problem involves understanding the reactivity of organic compounds and predicting the products of chemical reactions based on steric hindrance and stability.", "specific_scope": "The focus is on two specific reactions: the reaction of a ketone with an acrylate and the reaction of a nitroalkane with a nitrile in the presence of a base.", "goal": "Identify the major products of the given reactions by considering steric factors and the stability of the resulting compounds."}, "summary": "This problem requires knowledge of organic chemistry, specifically reaction mechanisms and product prediction. The first reaction involves a ketone reacting with an acrylate, leading to the formation of a product that considers steric hindrance and stability. The second reaction involves a nitroalkane reacting with a nitrile, where the major product is determined by similar factors. The correct answers for the products are C = methyl 3-(3-methyl-1,5-dimethyl-2-oxocyclohexyl)propanoate and D = 4-methyl-3-nitropentanenitrile."}