Whichof the following is a polymide?

Options

A. Teflon
B. Nylon-`6,6`
C. Bakelite
D. Terylene

Answer

To determine which of the following is a polyamide, we need to understand what a polyamide is. A polyamide is a type of polymer that contains repeating units linked by amide bonds. An amide bond is characterized by the presence of a nitrogen atom (N) bonded to a carbon atom that is also double-bonded to an oxygen atom (C=O).

### Step-by-Step Solution:

1. **Understand the Definition of Polyamide**:
- A polyamide is a polymer that contains amide linkages (-C(=O)NH-). This means that for a substance to be classified as a polyamide, it must have these specific bonds in its structure.

2. **Analyze the Given Options**:
- The options provided are:
- A) Teflon
- B) Nylon 66
- C) Bakelite
- D) Terylene

3. **Evaluate Each Option**:
- **Teflon**: This polymer is made from tetrafluoroethylene and does not contain any amide linkages. Thus, it is not a polyamide.
- **Nylon 66**: This is formed from hexamethylene diamine and adipic acid. The reaction between these two monomers leads to the formation of amide linkages, making Nylon 66 a polyamide.
- **Bakelite**: This is a thermosetting plastic made from phenol and formaldehyde. It does not contain amide linkages, so it is not a polyamide.
- **Terylene**: Also known as Dacron, this polymer is made from ester linkages (not amide linkages) and is therefore not a polyamide.

4. **Conclusion**:
- Among the options, only **Nylon 66** contains the amide linkages necessary to classify it as a polyamide. Therefore, the answer is **B) Nylon 66**.