Identify the monomer in the following polymeric structure
`[-overset(overset(O)(||))(C)-(CH_(2))_(8)- overset(overset(O)(||))(C)-NH-(CH_(2))_(8)-NH-]_(n)`

Answer

To identify the monomer in the given polymeric structure `[-overset(overset(O)(||))(C)-(CH_(2))_(8)- overset(overset(O)(||))(C)-NH-(CH_(2))_(8)-NH-]_(n)`, we can break down the structure and analyze its components step by step.

### Step-by-Step Solution:

1. **Analyze the Structure**:
The polymer structure consists of repeating units. The notation `[-...-]_(n)` indicates that the structure is made up of repeating units, where `n` represents the number of times the unit is repeated.

2. **Identify Functional Groups**:
In the structure, we can identify two key functional groups:
- The carbonyl group (C=O) which is part of a carboxylic acid (COOH).
- The amine group (NH2).

3. **Recognize the Peptide Bond**:
The presence of a peptide bond (C(=O)NH) suggests that the polymer is formed from amino acids. A peptide bond is formed when the carboxyl group of one amino acid reacts with the amino group of another, releasing a water molecule.

4. **Determine the Monomers**:
- The first monomer can be identified as an amino acid with the structure:
- Carboxylic acid part: `COOH`
- Hydrocarbon chain: `(CH2)8`
- The second monomer is another amino acid with the structure:
- Amine part: `NH2`
- Hydrocarbon chain: `(CH2)8`

5. **Write the Monomer Structures**:
- The first monomer can be represented as:
- **Monomer 1**: `HOOC-(CH2)8-C(=O)-NH2`
- The second monomer can be represented as:
- **Monomer 2**: `NH2-(CH2)8-COOH`

6. **Conclusion**:
Therefore, the monomers of the given polymeric structure are:
- Monomer 1: `HOOC-(CH2)8-NH2` (Amino acid with carboxylic acid)
- Monomer 2: `NH2-(CH2)8-COOH` (Amino acid with amine)