Preparation of nylon from hexamethylene diamene and adipic acid is an example of :

Options

A. addition polymerization
B. graft polymerization
C. condensation polymerization
D. copolymerization

Explanation

To solve the question regarding the preparation of nylon from hexamethylenediamine and adipic acid, we can follow these steps:

### Step 1: Identify the Reactants
- The reactants in this process are hexamethylenediamine (HMD) and adipic acid.
- Hexamethylenediamine has the formula: \( \text{H}_2\text{N(CH}_2)_6\text{NH}_2 \)
- Adipic acid has the formula: \( \text{HOOC(CH}_2)_4\text{COOH} \)

### Step 2: Understand the Reaction
- When hexamethylenediamine and adipic acid react, they form nylon through a polymerization process.
- This reaction involves the formation of amide bonds between the amine group of hexamethylenediamine and the carboxylic acid group of adipic acid.

### Step 3: Identify the Byproduct
- During the reaction, a water molecule (\( \text{H}_2\text{O} \)) is eliminated. This is a key characteristic of condensation reactions.

### Step 4: Determine the Type of Polymerization
- Since the reaction involves the elimination of water and the formation of a polymer (nylon), it is classified as condensation polymerization.
- In condensation polymerization, two monomers react to form a polymer while releasing a small molecule, such as water.

### Step 5: Conclusion
- Therefore, the preparation of nylon from hexamethylenediamine and adipic acid is an example of **condensation polymerization**.

### Final Answer
The correct answer is **third: condensation polymerization**.

---