(a) Sketch the carbon skeleton of 3-ethyl-2,5-hexadiene and point out the error in the IUPAC name
(b) Give the correct name of the compound.

Explanation

### Step-by-Step Solution:

#### Part (a): Sketch the Carbon Skeleton of 3-Ethyl-2,5-hexadiene and Point Out the Error in the IUPAC Name

1. **Identify the Base Structure**: The name "hexadiene" indicates that the compound has a six-carbon chain (hexane) with two double bonds (diene).

2. **Draw the Carbon Skeleton**: Start by sketching a straight chain of six carbon atoms:
```
...