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Which outcome diminishes catalytic efficiency of Ziegler-Natta catalysts?

A)Blocking active metal center's orbitals
B)Improved reactant diffusion to surface
C)Increased polymerization reaction enthalpy
D)Enhanced catalyst thermal stability

💡 Explanation

Blocking the active site diminishes the catalyst, because steric hindrance obstructs monomer coordination to the metal center’s d-orbitals. This prevents coordination and hence insertion polymerization, therefore catalytic activity decreases, rather than increases caused by alternatives.

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