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Which consequence results when 'k' exceeds limits during catalysis?

A)Kinetic isotope effect is amplified
B)Diffusion limits observed rate constant
C)Equilibrium shifts towards product formation
D)Thermodynamic control increases selectivity

💡 Explanation

When 'k' is very high in catalysed reaction, the rate is no longer determined by the catalyst, due to encountering mass-transport constraints; therefore the observed rate constant reduces below expectations because diffusion limitation, rather than achieving full turnover.

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