**Order of acidity** of phenol, water, ethanol:
- Phenol > water > ethanol
- Ethanol > water > phenol
- Water > phenol > ethanol
- All equal
Show answer and solution
Correct answer: A. Phenol > water > ethanol
pKa values: phenol 10.0
water 15.7; ethanol 15.9. So acidity: phenol > water > ethanol.
**Conjugate-base stability:** PhO⁻ (resonance) > OH⁻ > EtO⁻ (+I from ethyl destabilises).