Question

The ionisation constant of phenol is higher than that of ethanol because

• A. phenoxide ion is a stronger base than that of ethoxide ion
• B. phenoxide ion is stabilized through delocalization
• C. phenoxide ion is less stable than ethoxide ion
• D. phenoxide ion is bulkier than ethoxide ion.Phenol

Answer 1

Answer: (B)

The ionization constant of phenol is more than that of ethanol because phenoxide ion is stabilized by resonance.
Note: Ionization constant (Ka) of phenol is more than that of ethanol indicates phenol is more acidic than alcohol. Phenol on ionization gives phenoxide ion it is stabilized by resonance.