Monomer of `[NH-(CH_(2))_(5)-overset(O)overset(||)(S)]_(n)` is

Options

A.
B.
C.
D. `H_(2)NCONH_(2)`

Answer

To determine the monomer of the polymer represented by the structure `[NH-(CH_(2))_(5)-overset(O)overset(||)(S)]_(n)`, we can follow these steps:

### Step 1: Identify the Polymer
The given structure indicates a polymer with a repeating unit that includes nitrogen (N), carbon (C), and oxygen (O). The presence of the amine group (NH) and the carbon chain suggests that this polymer is likely a type of nylon.

### Step 2: Analyze the Structure
The structure `[NH-(CH_(2))_(5)-C(=O)]` suggests that it consists of a nitrogen atom connected to a carbon chain of five methylene groups (CH2) followed by a carbonyl group (C=O). This is characteristic of caprolactam, which is the monomer for nylon 6.

### Step 3: Confirm the Monomer
Caprolactam has the chemical structure:
- It contains a six-membered ring with one nitrogen atom and five carbon atoms, which corresponds to the polymer structure when it undergoes ring-opening polymerization.
- The structure of caprolactam can be represented as:
```
NH
|
C(=O)
|
CH2-CH2-CH2-CH2-CH2
```

### Step 4: Conclusion
Thus, the monomer of the polymer `[NH-(CH_(2))_(5)-C(=O)]_(n)` is **caprolactam**.

### Final Answer:
The monomer is **caprolactam**.

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