Ziegler-Natta catalyst is

Options

A. Triethylaluminium and titanium trichloride
B. Triethylaluminium and titanium tetrachloride
C. Trymethylaluminium amd titanium tetrachloride
D. Trymethylaluminium and titanium trichloride

Answer

### Step-by-Step Solution:

1. **Understanding the Catalyst**: A catalyst is a substance that increases the rate of a chemical reaction without undergoing any permanent change itself.

2. **Introduction to Ziegler-Natta Catalyst**: The Ziegler-Natta catalyst is a specific type of catalyst used primarily in the polymerization of alkenes, particularly ethylene and propylene.

3. **Components of Ziegler-Natta Catalyst**: The Ziegler-Natta catalyst typically consists of a combination of a transition metal compound (usually titanium chloride, TiCl4) and an organoaluminum compound (such as triethylaluminum, Al(C2H5)3).

4. **Mechanism of Action**: The Ziegler-Natta catalyst works by coordinating with the alkene monomers to facilitate their polymerization. The transition metal center helps in the insertion of the monomer into the growing polymer chain.

5. **Applications**: This catalyst system is widely used in the production of various types of polyolefins, such as polyethylene and polypropylene, which are important materials in the plastics industry.

6. **Advantages**: The use of Ziegler-Natta catalysts allows for the production of polymers with specific properties, such as high molecular weight and controlled stereochemistry, which are crucial for their application in various industries.