Which of the following dienes is chrial

Options

A. `CH_(3)-Ch=C=CH_(2)`
B. `CH_(3)-Ch=CH-CH=CH`
C. `CH_(3)-CH=C=CH-CH_(3)`
D. `CH_(2)=CH-CH_(2)-CH=CH_(2)`

Answer

To determine which of the given dienes is chiral, we need to analyze the structures of the compounds and check for chirality. A compound is chiral if it has no plane of symmetry and if it has four different substituents attached to a carbon atom.

### Step-by-Step Solution:

1. **Identify the Structures of the Dienes**:
- We need to look at the provided options for the dienes. Let's denote them as A, B, C, and D.

2. **Check for Chirality**:
- A compound is chiral if it has a carbon atom that is bonded to four different groups.
- For a diene (a compound with two double bonds), we will focus on the carbon atoms involved in the double bonds.

3. **Analyze Each Option**:
- **Option A**: Contains a structure where two of the substituents on one of the double-bonded carbons are the same (e.g., CH3 and H). This means it is not chiral.
- **Option B**: Does not contain a diene structure, so it cannot be chiral.
- **Option C**: Has a structure where both double-bonded carbons are bonded to different groups (e.g., CH3, CH, and H). This indicates that both carbons have four different substituents, making it chiral.
- **Option D**: Similar to Option A, it has identical substituents on one of the double-bonded carbons, indicating it is not chiral.

4. **Conclusion**:
- After analyzing all the options, we find that **Option C** is the only diene that is chiral because it has two double-bonded carbons, each attached to four different substituents.

### Final Answer:
**Option C is chiral.**

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