Classification of Alcohols Primary:carbon with-OH is bonded to one other carbon. Secondary:carbon with-OH is bonded to two other carbons. Tertiary:carbon with -OH is bonded to three other carbons. Aromatic (phenol):-OH is bonded to a benzene ring. Chapter 10 3 Chapter 10 3 Classification of Alcohols • Primary: carbon with —OH is bonded to one other carbon. • Secondary: carbon with —OH is bonded to two other carbons. • Tertiary: carbon with —OH is bonded to three other carbons. • Aromatic (phenol): —OH is bonded to a benzene ring