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Problem 8 - Olympiad

Two chemists are debating the mechanism of a newly synthesized catalyst. Chemist X believes the catalyst functions by providing an alternative reaction pathway with a lower activation energy, based on quantum mechanical calculations. Chemist Y argues that the catalyst primarily works by stabilizing an intermediate product, thereby shifting the reaction equilibrium towards the products, based on spectroscopic analysis of the reaction mixture. Which experiment would most directly help to resolve this disagreement?

Correct: B

Chemist X focuses on activation energy, while Chemist Y focuses on stabilizing an intermediate and shifting equilibrium. Measuring the concentration of the intermediate product (Choice B) during the reaction would directly test Chemist Y's claim. If the intermediate product's concentration is significantly higher and more stable in the presence of the catalyst, it would support Chemist Y. If there's no significant change in intermediate stability but a clear increase in reaction rate (which would be inferred from A, but B is more specific to Y's claim), it would lean towards Chemist X. Choice A relates to kinetics but doesn't directly distinguish the two mechanisms as clearly as B. Choices C and D are less relevant to the proposed mechanisms.