Aliphatic hydrocarbons are classified as ____ alkenes and alkynes. (alkanes, arenes)

Explanation

To solve the question "Aliphatic hydrocarbons are classified as ____ alkenes and alkynes," we need to understand the classification of hydrocarbons.

### Step-by-Step Solution:

1. **Understanding Hydrocarbons**: Hydrocarbons are organic compounds that consist entirely of hydrogen and carbon. They can be classified into two main categories: aliphatic hydrocarbons and aromatic hydrocarbons.

**Hint**: Remember that hydrocarbons can be divided based on their structure into two main types.

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