Key terms: (3°)primary (1°)secondary (2°) alcohols are alcohols having the general structure r₃coh. (or oxiranes) are cyclic ethers having the oxygen atom as part of a three-membered ring. have a hydroxy group as a substituent on a benzene ring. alcohols are alcohols having the general structure rch₂oh. have two alkyl groups bonded to an oxygen atom. have an oh group on a carbon of a c-c double bond. alcohols are alcohols having the general structure r₂choh.