Which is the monomer of neoprene in the following?

Options

A. `CH_(2)=CH-C=CH`
B. `CH_(2)=underset(CH_(3))underset(|)C-CH=CH_(2)`
C. `CH_(2)=underset(Cl)underset(|)C-CH=CH_(2)`
D. `CH_(2)=CH-CH=CH_(2)`

Explanation

To determine the monomer of neoprene, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Neoprene**: Neoprene is a type of synthetic rubber. It is important to know its characteristics and applications, which include use in gaskets, rings, cables, jackets, and hose pipes.

2. **Determine the Monomer**: The monomer that polymerizes to form neoprene is 2-chloro-1,3-butadiene. This compound is also known as chloroprene.

3. **Chemical Structure of the Monomer**: The chemical structure of 2-chloro-1,3-butadiene can be represented as follows:
- It has four carbon atoms (C4).
- The structure includes a double bond between the first and second carbon atoms and a chlorine atom attached to the second carbon.

4. **Polymerization Process**: When 2-chloro-1,3-butadiene undergoes polymerization, it forms long chains of neoprene. The double bond in the monomer allows for the formation of these chains through a process called addition polymerization.

5. **Final Structure of Neoprene**: The resulting polymer, neoprene, has a repeating unit derived from the monomer, which can be depicted as:
- CH2=C(CHCl)-CH=CH2
- This structure shows the arrangement of carbon atoms and the presence of chlorine in the polymer chain.

### Conclusion:
The monomer of neoprene is **2-chloro-1,3-butadiene**.

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