The structure of Nylon -6 is :

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Answer

To determine the structure of Nylon-6, we start with its monomer, which is caprolactam. Here’s a step-by-step breakdown of how to derive the structure of Nylon-6:

### Step 1: Identify the Monomer
The monomer unit of Nylon-6 is caprolactam. Caprolactam is a cyclic amide (lactam) with the following structure:

- It contains a 7-membered ring.
- The ring consists of 5 carbon atoms and 1 nitrogen atom, along with a carbonyl group (C=O).

### Step 2: Draw the Structure of Caprolactam
The structure of caprolactam can be represented as follows:

```
O
||
CH2-CH2-CH2-CH2-CH2-NH
```
This shows the 5 carbon atoms (C) and 1 nitrogen atom (N) in the ring, along with the carbonyl group (C=O).

### Step 3: Polymerization Process
When caprolactam is heated (typically at around 533 K) in the presence of an inert gas, it undergoes a polymerization process. This involves the opening of the lactam ring and the formation of amide linkages between the monomer units.

### Step 4: Form the Polymer Structure
During the polymerization, the caprolactam units link together to form Nylon-6. The repeating unit in the polymer can be represented as:

```
[-NH-(CH2)5-CO-]n
```
Where "n" indicates that this unit repeats multiple times to form the polymer chain.

### Step 5: Final Structure of Nylon-6
The final structure of Nylon-6 can be summarized as a long chain of repeating units of the form:

```
O
||
-NH-(CH2)5-
```
This structure shows the amide (–NH–) and the carbon chain (–(CH2)5–) along with the carbonyl (C=O) groups.

### Conclusion
The structure of Nylon-6 is characterized by its repeating units derived from caprolactam, forming a long polymer chain with amide linkages.