In which of the following polymers ethylene gylcol is one of the monomer units?

Options

A.
B. `(-- CH_(2)-CH_(2)--)_(n)`
C.
D. `[--O- underset(CH_(3))underset(|)CH-CH_(2)- underset(O) underset(||)C-O- underset(CH_(2)CH_(3)) underset(|)CH-CH_(2)-underset(O) underset(||)C--]_(n)`

Answer

To solve the question "In which of the following polymers is ethylene glycol one of the monomer units?", we can follow these steps:

### Step 1: Understand Ethylene Glycol
Ethylene glycol (C2H6O2) is a simple diol compound that can serve as a monomer in various polymerization processes. It is commonly used in the production of polyesters and other polymers.

### Step 2: Identify the Polymers
We need to analyze the given options (though not listed here) to see which polymer includes ethylene glycol as a monomer. Common polymers that include ethylene glycol include:

- Polyethylene glycol (PEG)
- Polyethylene terephthalate (PET)
- Pterylene (as mentioned in the video)

### Step 3: Check Each Polymer
For each polymer option provided in the question, we need to determine if ethylene glycol is a monomer unit:

1. **Polyethylene Glycol (PEG)**: This polymer is made entirely from ethylene glycol.
2. **Polyethylene Terephthalate (PET)**: This polymer is made from ethylene glycol and terephthalic acid.
3. **Pterylene**: This polymer contains ethylene glycol as one of its monomer units.

### Step 4: Conclusion
Based on the analysis, if the options include pterylene, polyethylene glycol, or polyethylene terephthalate, we can conclude that ethylene glycol is indeed a monomer in these polymers. However, since the video specifically mentions pterylene, we can state that:

**Correct Answer: Pterylene (if it is one of the options).**