The structure of Neoprene is -

Options

A. `[--CH_2 CH = CH- CH_2 - CH_2 - underset(CN)underset(|)CN--]_n`
B. `[-- CH_2- underset(CN)underset(|)CN--]_n`
C. `[--CH_2-overset(Cl)overset(|)C=CN-CH_2--]_n`
D.

Answer

To determine the structure of neoprene, we will follow these steps:

### Step 1: Understand the Monomer
Neoprene is derived from the polymerization of chloroprene, which has the chemical structure of 2-chloro-1,3-butadiene. The structure of chloroprene can be represented as:
\[ \text{CH}_2=C(\text{Cl})-CH=CH_2 \]

### Step 2: Identify the Polymerization Process
Neoprene is formed through the free radical polymerization of chloroprene. During this process, the double bonds in the chloroprene monomers open up and link together to form long chains.

### Step 3: Draw the Repeating Unit
When chloroprene undergoes polymerization, the repeating unit of neoprene can be represented as:
\[ \text{(CH}_2-\text{C}(\text{Cl})-\text{CH}=\text{CH}_2\text{)}_n \]
where \( n \) indicates the number of repeating units in the polymer chain.

### Step 4: Write the Structure of Neoprene
The structure of neoprene can be simplified to show the key features:
- The backbone consists of carbon atoms.
- There are chlorine atoms attached to the carbon atoms in the polymer chain.

The structure can be drawn as follows:
```
Cl
|
CH2 - C - CH = CH2
```
This represents a segment of the neoprene polymer, where the chlorine atom is attached to one of the carbon atoms in the chain.

### Step 5: Confirm the Structure
To confirm the structure, we can compare it with the options provided in the question. The correct structure of neoprene should have alternating double bonds and chlorine atoms in the polymer chain.

### Conclusion
The structure of neoprene is confirmed as:
```
Cl
|
CH2 - C - CH = CH2
```
This structure corresponds to the correct option provided in the question.

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