Allene is an example of

Options

A. Conjugated diene
B. cumulated diene
C. isolated diene
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Allene**: Allene is a hydrocarbon with the formula C3H4. It has a unique structure where two double bonds are connected to the same carbon atom.

2. **Identifying the Type of Diene**: In organic chemistry, dienes are classified based on the arrangement of their double bonds. There are three main types:
- **Cumulated Dienes**: Dienes where the double bonds are adjacent to each other, sharing a common atom.
- **Conjugated Dienes**: Dienes where the double bonds are separated by a single bond.
- **Isolated Dienes**: Dienes where the double bonds are separated by more than one single bond.

3. **Classifying Allene**: Since allene has two double bonds that are directly connected to the same carbon atom, it fits the definition of a cumulated diene.

4. **Conclusion**: Therefore, allene is classified as a cumulated diene.

**Final Answer**: Allene is an example of a cumulated diene.

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