{"knowledge_schema": {"broad_category": "Chemistry \u2192 Molecular Symmetry", "refinement": "This problem involves understanding the molecular symmetry of a specific compound (product E) based on its chemical reactions and structure.", "specific_scope": "The focus is on determining the symmetry group of product E, which is formed through a series of reactions involving other compounds and gases.", "goal": "Identify the correct molecular symmetry group from the given options based on the characteristics of product E."}, "summary": "This problem requires knowledge of molecular symmetry and the ability to analyze the structure of a compound formed through chemical reactions. The task is to determine the molecular symmetry group of product E, which is derived from the reactions of other compounds. By understanding the nature of the reactions and the resulting structure of E, students can select the appropriate symmetry group from the provided options."}