Nylon-6,6 is an example of

Options

A. polystyrene
B. polypropylene
C. polyamide
D. polyisoprene

Explanation

To determine what type of polymer Nylon-6,6 is, we can follow these steps:

### Step 1: Identify the Monomeric Units
Nylon-6,6 is synthesized from two specific monomeric units: hexamethylene diamine and adipic acid.

### Step 2: Understand the Structure of Monomers
- **Hexamethylene diamine** has the structure:
\[ H_2N-(CH_2)_6-NH_2 \]
- **Adipic acid** has the structure:
\[ HOOC-(CH_2)_4-COOH \]

### Step 3: Identify the Type of Linkage
When hexamethylene diamine reacts with adipic acid, they undergo a condensation reaction to form an amide linkage:
\[ NH_2-(CH_2)_6-NH_2 + HOOC-(CH_2)_4-COOH \rightarrow \text{Nylon-6,6} + H_2O \]
This results in the formation of repeating units with an amide bond (–C(=O)NH–).

### Step 4: Classify the Polymer
Since Nylon-6,6 contains amide linkages between its repeating units, it is classified as a **polyamide**.

### Conclusion
Thus, Nylon-6,6 is an example of a polyamide.

### Final Answer
C. Polyamide

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