Final answer:
The chemical class of substances called "alcohol" includes primary, secondary, and tertiary alcohols.
Step-by-step explanation:
The chemical class of substances called "alcohol" includes primary, secondary, and tertiary alcohols. Primary alcohols have the hydroxyl group (-OH) attached to a carbon atom that is bonded to only one other carbon. An example is ethyl alcohol. Secondary alcohols have the hydroxyl group attached to a carbon atom that is bonded to two other carbon atoms. An example is isopropyl alcohol. Tertiary alcohols have the hydroxyl group attached to a carbon atom that is bonded to three other carbon atoms. An example is tert-butyl alcohol.