Which of the following polymers are having vinylic monomer units

Options

A. Acrilan
B. Polystyrene
C. Nylon
D. Teflon

Explanation

To determine which of the given polymers have vinylic monomer units, we need to identify the monomeric units of each polymer and check if they contain the vinylic group, which is characterized by the presence of a CH2=CH- structure.

### Step-by-Step Solution:

1. **Understand Vinylic Monomer Units**:
- Vinylic monomers are those that contain a vinyl group, which is defined as having the structure CH2=CH-. This means there are two carbon atoms connected by a double bond, with one of the carbons also bonded to a hydrogen atom.

2. **Identify the Given Polymers**:
- The polymers provided are:
- Acrylan
- Polystyrene
- Nylon
- Teflon

3. **Determine the Monomeric Units**:
- **Acrylan**: The monomer is acrylonitrile (CH2=CH-CN). It contains a vinylic group.
- **Polystyrene**: The monomer is styrene (CH2=CH-C6H5). It also contains a vinylic group.
- **Nylon**: The monomeric units depend on the specific type of nylon. For nylon 6,6, the monomers are hexamethylenediamine and adipic acid, neither of which contains a vinylic group.
- **Teflon**: The monomer is tetrafluoroethene (CF2=CF2). It contains a vinylic group.

4. **Conclusion**:
- From the analysis, the polymers that have vinylic monomer units are:
- Acrylan (from acrylonitrile)
- Polystyrene (from styrene)
- Teflon (from tetrafluoroethene)
- Nylon does not have vinylic monomer units.

### Final Answer:
The polymers that have vinylic monomer units are:
- Acrylan
- Polystyrene
- Teflon