The monor unit of the following polymer
`{NH-CO-NH-CH_(2)}_(n)`

Options

A. Glycine and formadehyde
B. Urea and ethanol
C. Urea and formaldenyde
D. Glycine and adipic acid

Answer

To determine the monomer unit of the given polymer `{NH-CO-NH-CH_(2)}_(n)`, we will analyze the structure and identify the monomers involved in its formation.

### Step-by-Step Solution:

1. **Identify the Structure of the Polymer**:
The given polymer can be represented as:
\[ \text{NH-CO-NH-CH}_2 \]
This indicates that the polymer consists of repeating units that include an amide linkage (NH-CO) and a methylene group (CH₂).

2. **Recognize Possible Monomers**:
To form the structure of the polymer, we need to identify the monomers that can combine to create the repeating unit. The presence of the amide group suggests that urea (NH₂-CO-NH₂) could be a potential monomer.

3. **Consider the Other Component**:
The CH₂ group in the polymer suggests that there is another component involved. The simplest compound that can provide a methylene group (CH₂) is formaldehyde (HCHO).

4. **Write the Reaction**:
The formation of the polymer can be described by a condensation reaction between urea and formaldehyde. The reaction can be summarized as:
\[ \text{Urea} + \text{Formaldehyde} \rightarrow \text{Polymer} + \text{H}_2\text{O} \]
In this reaction, water is eliminated, leading to the formation of the polymer structure.

5. **Identify the Monomeric Units**:
The monomeric units that combine to form the polymer are urea and formaldehyde. The resulting structure after the reaction will yield the repeating unit of the polymer:
\[ \text{NH-CO-NH-CH}_2 \]

6. **Conclusion**:
Therefore, the monomer unit of the given polymer `{NH-CO-NH-CH_(2)}_(n)` is derived from urea and formaldehyde.

### Final Answer:
The monomer unit of the polymer `{NH-CO-NH-CH_(2)}_(n)` is urea and formaldehyde.

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