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Chapter 7: Problem 33

This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct. Zeigler-Natta catalyst is (a) \(\left(\mathrm{C}_{6} \mathrm{H}_{5}\right)_{3} \mathrm{Al}\) and \(\mathrm{TiCl}_{4}\) (b) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{Al}\) and \(\mathrm{ZnCl}_{2}\) (c) \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{Al}\) and \(\mathrm{TiCl}_{4}\) (d) \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{TiCl}_{4}\)

Short Answer

Expert verified
Short Answer: The most commonly used combination of compounds in a Zeigler-Natta catalyst is triethylaluminum \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{Al}\) and titanium tetrachloride \(\mathrm{TiCl}_{4}\).

Step by step solution

01

Recall the Components of a Zeigler-Natta Catalyst

The Zeigler-Natta catalyst consists of a transition metal compound, commonly titanium tetrachloride (TiCl4), and an organoaluminum compound, which acts as a co-catalyst. Keep this in mind while analyzing the given choices.
02

Analyze the Given Choices

We will now analyze each choice provided and check for the presence of an organoaluminum compound and a transition metal compound: (a) \(\left(\mathrm{C}_{6} \mathrm{H}_{5}\right)_{3} \mathrm{Al}\) and \(\mathrm{TiCl}_{4}\): This choice contains an organoaluminum compound (triarylaluminum) and a transition metal compound (titanium tetrachloride). (b) \(\left(\mathrm{CH}_{3}\right)_{3} \mathrm{Al}\) and \(\mathrm{ZnCl}_{2}\): This choice contains an organoaluminum compound (trimethylaluminum), but zinc chloride is not a transition metal compound. (c) \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{Al}\) and \(\mathrm{TiCl}_{4}\): This choice contains an organoaluminum compound (trialkylaluminum) and a transition metal compound (titanium tetrachloride). (d) \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{TiCl}_{4}\): This choice contains a transition metal compound (titanium tetrachloride), but it does not contain an organoaluminum compound.
03

Identifying the Correct Choice

From our discussion in Step 2, we found that choice (a) and choice (c) contains the correct components to form the Zeigler-Natta catalyst. Among these, the most commonly used organoaluminum compound for the Zeigler-Natta catalyst is trialkylaluminum, specifically triethylaluminum, which is given in choice (c). So, the correct choice is (c) \(\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{Al}\) and \(\mathrm{TiCl}_{4}\).

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