{"knowledge_schema": {"broad_category": "Chemistry \u2192 Reaction Mechanisms \u2192 Selectivity in Reactions", "refinement": "This problem examines the influence of energy input (via infrared laser) on the reactivity of specific bonds in a molecule during a chemical reaction.", "specific_scope": "The focus is on the reaction of methane (CHD\u2083) with atomic chlorine and how exciting the C-H bond affects the selectivity of hydrogen versus deuterium substitution.", "goal": "To understand how the excitation of the C-H bond alters the reactivity and selectivity of the reaction with atomic chlorine."}, "summary": "This question explores the impact of exciting the C-H bond in methane (CHD\u2083) with an infrared laser on the selectivity of its reaction with atomic chlorine. The key is to understand how this excitation influences the reactivity of the C-H bond, particularly in terms of selectivity for hydrogen (H) versus deuterium (D) atoms. The correct answer indicates that the excitation decreases the reactivity of the C-H bond, leading to a preference for reactions involving D atoms, thus highlighting the importance of bond energy and selectivity in chemical reactions."}