Which one of the following is most stable ?

Options

A. `CH_3-CH=CH-CH=CH-CH_3`
B. `CH_2=CH-CH=CH_2`
C. `CH_2=CH-CH_2-CH=CH_2`
D. `CH_3-CH=CH-CH_3`

Explanation

To determine which alkene is the most stable among the given options, we can follow these steps:

### Step 1: Identify the Structure of Each Alkene
- Look at the molecular structures of the alkenes provided in the options. Identify if they are simple alkenes, conjugated dienes, or more complex structures.

### Step 2: Analyze Conjugation
- Check if any of the alkenes have conjugated double bonds. Conjugated systems (where double bonds are separated by a single bond) are generally more stable due to resonance stabilization.

### Step 3: Count Alpha Hydrogens
- For each alkene, identify the alpha carbons (the carbons directly attached to the double bond) and count the number of alpha hydrogens attached to them.
- The more alpha hydrogens an alkene has, the more stable it typically is. This is because the presence of more alpha hydrogens allows for greater hyperconjugation and stabilization of the double bond.

### Step 4: Compare Stability
- Compare the stability of the alkenes based on the presence of conjugation and the number of alpha hydrogens.
- The alkene with the most alpha hydrogens and/or conjugated double bonds will be the most stable.

### Step 5: Conclusion
- Based on the analysis, conclude which alkene is the most stable.

### Final Answer
- The alkene with the highest number of alpha hydrogens and/or conjugated double bonds is the most stable.

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