Type Structure Examples H CH3 Primary alcohol OH CH3CH2-OH CH3CHCH2一OH CH2一OH ethanol 2-methyl-1-propanol benzyl alcohol CH3 R CH-OH H OH Secondary alcohol OH CH2 H CH3 HO 2-butanol cyclohexanol cholesterol R CH3 Ph CH Tertiary alcohol OH CH3-C-OH Ph一C一OH OH CH3 Ph 2-methyl-2-propanol triphenylmethanol 1-methylcyclopentanol OH OH OH Phenols OH CH3 HO phenol 3-methylphenol hydroquinone