Final answer:
Tertiary, primary, and secondary alcohols are categorized by the number of alkyl groups attached to the carbon with the hydroxyl group. Epoxides are three-membered cyclic ethers, phenols have a hydroxy group on a benzene ring, and ethers possess two alkyl groups bonded to oxygen. Enols have a hydroxyl group on a carbon-carbon double bond.
Step-by-step explanation:
Tertiary alcohols are alcohols having the general structure R₃COH. Epoxides (or oxiranes) are cyclic ethers having the oxygen atom as part of a three-membered ring. Phenols have a hydroxy group as a substituent on a benzene ring. Primary alcohols are alcohols having the general structure RCH₂OH. Ethers have two alkyl groups bonded to an oxygen atom. Enols have an OH group on a carbon of a C-C double bond. Secondary alcohols are alcohols having the general structure R₂CHOH. Alcohols contain a hydroxy group bonded to an sp³ hybridized carbon atom.