{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Reactions \u2192 Nucleophilic Addition and Hydrolysis", "refinement": "This problem involves identifying suitable reagents for specific organic transformations, including nucleophilic addition and subsequent hydrolysis reactions.", "specific_scope": "The focus is on the reactions of butan-2-one with sodium cyanide and the conversion of a nitrile compound to a carboxylic acid.", "goal": "Select the correct reagents that facilitate the desired transformations in the given organic reactions."}, "summary": "In this problem, we are tasked with selecting appropriate reagents for two organic reactions. The first reaction involves the nucleophilic addition of sodium cyanide to butan-2-one, leading to the formation of 2-hydroxy-2-methylbutanenitrile, which requires a reagent that can facilitate this addition, such as NaHSO3. The second reaction involves the hydrolysis of a nitrile compound to form a carboxylic acid, which is typically achieved using an acid like HCl. The correct choice of reagents is A = NaHSO3 and B = HCl, as they effectively facilitate the required transformations."}