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Ziegler-Natta catalysts are valued because they give polymers of

  • A.no crystallinity whatever the monomer used
  • B.controlled stereochemistry and high crystallinity
  • C.very low molecular mass and wide distribution
  • D.random branching throughout the chain

Answer: B

A titanium halide with an aluminium alkyl orients each monomer as it adds, so isotactic polypropylene can be made at all. High-density polyethylene from the same route is linear and far stronger than the branched free radical product.

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