Which of the following compounds is not chiral ?

Options

A. `CH_(3)"CHDCH"_(2)`Cl
B. `CH_(3)CH_(2)`CHDCl
C. `DCH_(2)CH_(2)CH_(2)`Cl
D. `CH_(2)"CHClCH"_(2)` D

Answer

To determine which of the given compounds is not chiral, we need to analyze the structures of each compound and identify the presence of chiral centers. A chiral center, typically a carbon atom, must have four different substituents attached to it.

### Step-by-Step Solution:

1. **Identify the Compounds**: Start by listing the compounds provided in the question. For this example, let's assume we have four compounds labeled A, B, C, and D.

2. **Draw the Structures**: For each compound, draw its molecular structure. This will help visualize the arrangement of atoms and groups around the carbon atoms.

3. **Check for Chiral Centers**:
- **Compound A**: Look for carbon atoms that have four different groups attached. If you find one, mark it as a chiral center.
- **Compound B**: Repeat the process for this compound. Identify if there is a carbon with four different substituents.
- **Compound C**: Analyze this compound carefully. If you find that a carbon atom has two identical groups (like two hydrogens), it cannot be chiral.
- **Compound D**: Check this compound as well for chiral centers.

4. **Evaluate the Results**:
- If a compound has at least one chiral center, it is considered chiral.
- If a compound does not have any chiral centers (like compound C, which has identical substituents), it is not chiral.

5. **Conclusion**: Based on the analysis, identify which compound does not have a chiral center. In this case, it is compound C.

### Final Answer:
The compound that is not chiral is **Compound C**.