{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reaction Mechanisms", "refinement": "This problem involves understanding the reactions of alkenes and alcohols, specifically focusing on electrophilic addition and dehydration reactions.", "specific_scope": "The task is to predict the major products of two specific reactions: the Diels-Alder reaction of 1,3-dimethylcyclohexene with maleic anhydride and the dehydration of 2-methyl-2-butanol in the presence of sulfuric acid.", "goal": "Identify the major products of the reactions based on regioselectivity and stability considerations."}, "summary": "This problem requires knowledge of organic chemistry reactions, specifically the Diels-Alder reaction and dehydration of alcohols. The first reaction involves 1,3-dimethylcyclohexene reacting with maleic anhydride to form a dicarboxylic anhydride, where regioselectivity leads to the formation of 3,4-dimethyl-3-cyclohexene-1,2-dicarboxylic anhydride as the major product. The second reaction involves the dehydration of 2-methyl-2-butanol, which, under acidic conditions, leads to the formation of 2-methyl-2-butene as the major product due to the stability of the resulting alkene. Thus, the correct answer is C = 3,4-dimethyl-3-cyclohexene-1,2-dicarboxylic anhydride, D = 2-methyl-2-butene."}