Consider the following proposed two-step mechanism for the hydration of acetone…
CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics
Problem
Consider the following proposed two-step mechanism for the hydration of acetone catalyzed by a single proton H+ in aqueous solution.
Step 1: H++CH3COCH3→CH3C(OH)(OH)CH3 (rate-determining)
Step 2: CH3C(OH)(OH)CH3→CH3COCH3+H+
Which classification of catalysis is MOST consistent with the function of H+ in this mechanism?
(a) Homogeneous catalysis, because the proton and all reactants are in the same aqueous phase.
(b) Binding (orientation) catalysis, because the proton holds the acetone molecule in a favorable geometry.
(c) Covalent (acid–base) catalysis, because the proton forms and later breaks a bond during the intermediate step.
(d) Autocatalysis, because the regenerated proton appears as a product that drives further reaction.