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Which mechanism limits chain propagation rate for linear polyethylene production with a Ziegler-Natta catalyst?

A)Steric hindrance of monomer insertion
B)Catalyst poisoning via oxygen exposure
C)Chain transfer to aluminum alkyl
D)Beta-hydride elimination termination

💡 Explanation

Steric hindrance limits chain propagation because bulky catalyst ligands near the active site inhibit monomer insertion, therefore lowering reaction rate, rather than termination events controlling polymer molecular weight predominantly.

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