A Ziegler-Natta catalyst consists of

A $AlCl X_{3}$ and $H X_{2} O$
B $BF X_{3}$ and $H X_{2} O$
C $TiCl X_{4}$ and $Al (C X_{2} H X_{5}) X_{3}$
D $NaNH X_{2}$ in liquid ammonia

Answer: C

The Ziegler-Natta catalyst is titanium tetrachloride with triethylaluminium. It allows stereoregular polymerisation, for example isotactic polypropene.

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