Master Reference — Alcohols, Phenols & Ethers Overview — Notes

Cue Column	Note-Taking Column
What are the 3 classes?	Alcohols (R-OH), Phenols (Ar-OH), Ethers (R-O-R')
How are alcohols classified?	1°: $RCH_{2}OH$ , 2°: $R_{2}CHOH$ , 3°: $R_{3}COH$ — based on C bonded to -OH
Key preparation of alcohols	Acid-hydration of alkenes (Markovnikov), Grignard + carbonyl, Reduction ( $NaBH_{4}$ or $LiAlH_{4}$ )
Why is phenol more acidic?	Phenoxide stabilized by resonance delocalization over ring (5 resonance structures); pKa ~10 vs alcohol pKa ~16-18
Key test for alcohol type?	Lucas test: $ZnCl_{2}$ /conc. HCl — 3° immediate turbidity, 2° delayed (5-20 min), 1° no turbidity at RT
Best synthesis of ethers?	Williamson synthesis: $RO^{-}$$Na^{+}$ + R'X (must be 1° halide, SN2)

Summary (Bottom): Alcohols, phenols, and ethers share the oxygen functional group but differ sharply in acidity and reactivity. Phenol is far more acidic than alcohols due to resonance stabilization of the phenoxide ion. Lucas test, the oxidation ladder (PCC vs $KMnO_{4}$ ), and Williamson synthesis with 1° halides are the three highest-priority NEET concepts.

Phenol (hydroxybenzene) structure — -OH group activates ring for EAS