{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Pericyclic Reactions", "refinement": "This problem specifically deals with sigmatropic rearrangements, which are a subset of pericyclic reactions characterized by the migration of pi bonds into sigma bonds under thermal conditions.", "specific_scope": "The task involves predicting the products of specific reactions involving starting materials that undergo sigmatropic rearrangements when heated in the presence of acid.", "goal": "Identify the correct products (A, B, and C) of the given reactions based on the principles of sigmatropic rearrangements."}, "summary": "This problem focuses on predicting the outcomes of sigmatropic rearrangements, a type of pericyclic reaction where pi bonds migrate into sigma bonds. The reactions provided involve specific organic compounds that, when treated with heat and acid, yield distinct products. The goal is to determine the correct structures of the products A, B, and C based on the principles of these rearrangements. The correct answer identifies the products as (Z)-1-(but-2-en-2-yloxy)ethen-1-amine for A, (3Z,4E)-3,4-diethylidenecyclobut-1-ene for B, and 4-methylenehexanal for C."}