Alkenes are ______hydrocarbons. (saturated/unsaturated)

Explanation

**Step-by-Step Solution:**

1. **Understanding Hydrocarbons**: Hydrocarbons are organic compounds made up of hydrogen and carbon atoms. They can be classified into two main categories: saturated and unsaturated hydrocarbons.

2. **Defining Saturated Hydrocarbons**: Saturated hydrocarbons are those that contain only single bonds between carbon atoms (C-C). This means that each carbon atom is bonded to as many hydrogen atoms as possible. Examples include alkanes like methane (CH4) and ethane (C2H6).

3. **Defining Unsaturated Hydrocarbons**: Unsaturated hydrocarbons, on the other hand, contain one or more double bonds (C=C) or triple bonds (C≡C) between carbon atoms. This means that they have fewer hydrogen atoms than saturated hydrocarbons. Examples include alkenes (which contain at least one double bond) and alkynes (which contain at least one triple bond).

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