Orlon has a unit

Options

A. Vinyl cyanide
B. Acrolein
C. Glycol
D. Isoprene

Explanation

### Step-by-Step Solution:

1. **Identify Orlon**:
- Orlon is identified as a synthetic acrylic fiber, which is primarily composed of polyacrylonitrile.

2. **Understand the Composition**:
- The chemical structure of Orlon is derived from a specific monomer known as acrylonitrile. The repeating unit of Orlon is based on this monomer.

3. **Determine the Monomer**:
- The monomer for Orlon is vinyl cyanide, which is chemically represented as CH2=CH-CN (acrylonitrile).

4. **Recognize the Polymerization Type**:
- Orlon is classified as an addition polymer, meaning it is formed by the addition of monomer units without the loss of any small molecules.

5. **Write the Structure of Orlon**:
- The structure of Orlon can be represented as a chain of repeating units of the monomer, which looks like:
- \[ -[CH_2-CH(CN)]_n - \]
- Here, "n" indicates the number of repeating units in the polymer chain.

6. **Summarize the Key Points**:
- Orlon is a polyacrylonitrile fiber, resistant to sunlight and gases, and is used in textiles. Its monomer is vinyl cyanide (acrylonitrile).