Which of the following is a syndiotactic polymer in `[-CH_(2)-C(YZ)-]_(n)`

Options

A. All Y groups lie on one side of the chain and all Z groups on the other side
B. The Y and Z group lie alternately on each side of the chain
C. The Y and Z group are arranged in a random fasion
D. Y and Z group are same

Explanation

To determine which of the following is a syndiotactic polymer in the structure `[-CH₂-C(YZ)-]n`, we need to understand the definitions of different types of stereochemical arrangements of polymers, specifically syndiotactic, isotactic, and atactic.

### Step-by-Step Solution:

1. **Understanding Syndiotactic Polymers**:
- A syndiotactic polymer is characterized by the alternating arrangement of substituents on either side of the polymer chain. In this case, if we have groups Y and Z, they should alternate in position along the chain.

2. **Identifying Isotactic and Atactic Structures**:
- **Isotactic**: In an isotactic polymer, all the substituent groups (Y) are on one side of the polymer chain, while the other groups (Z) are on the opposite side. This creates a regular pattern.
- **Atactic**: In an atactic polymer, the arrangement of substituents is random, with no specific order.

3. **Analyzing the Given Structure**:
- The structure `[-CH₂-C(YZ)-]n` implies that we have a repeating unit where Y and Z can be positioned in different ways.
- For a syndiotactic arrangement, we would expect Y and Z to alternate in their positions along the polymer chain.

4. **Conclusion**:
- If the arrangement of Y and Z groups is such that they alternate (e.g., Y on one side, Z on the other, then Z on one side, Y on the other), then this polymer can be classified as syndiotactic.
- Therefore, the correct answer is that the arrangement where Y and Z groups alternate on each side of the chain represents a syndiotactic polymer.

### Final Answer:
The syndiotactic polymer in the structure `[-CH₂-C(YZ)-]n` is characterized by the alternating arrangement of Y and Z groups on either side of the chain.

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