Identify a class of compounds that has a functional group –OH.

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**Solution:**

1. The functional group –OH is called the **hydroxyl group**.

2. Compounds containing the hydroxyl group are classified as **alcohols**.

3. Other options:
   - **Ethane** is an alkane with formula C₂H₆ and does not contain –OH.
   - **Ketones** contain a carbonyl group (C=O) bonded to two carbon atoms, not –OH.
   - **Aldehydes** contain a carbonyl group (C=O) bonded to at least one hydrogen atom, not –OH.

**Answer:** Alcohol

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