{"knowledge_schema": {"broad_category": "Chemistry \u2192 Reaction Mechanisms \u2192 Halogenation", "refinement": "This problem examines the reactivity of different types of bonds (C-H vs. C-D) in the context of a halogenation reaction involving atomic chlorine.", "specific_scope": "The focus is on the specific reaction of methane (CHD\u2083) with atomic chlorine and how the presence of deuterium affects the reaction dynamics.", "goal": "To understand how the excitation of the C-D bond influences the overall reaction rate and selectivity in the presence of atomic chlorine."}, "summary": "This question explores the effect of exciting the C-D bond in a methane molecule (CHD\u2083) during its reaction with atomic chlorine. The key point is that the C-D bond is generally stronger and less reactive than the C-H bond, leading to a decreased reactivity of the C-D bond. As a result, the reaction primarily involves the C-H bonds, causing only hydrogen atoms to react with chlorine, which ultimately decreases the overall reaction rate for the C-D bond."}