Alcohol and phenols can be thought of as organic derivatives of water in which one of the water hydrogens is replaced by an organic group : H-O-H versus R-O-H and Ar-O-H. in practice, the group name alcohol is restricted to compounds that have their –OH group bonded to a saturated, sp3-hybeidized canbon atom, while compounds with their –OH group bonded toa vinylic, sp2-hybridized carbon are called enols. We’ll look at enols in chapter 22.