Question

The ionization constant of phenol is more than that of ethanol because:

• A. phenoxide ion is a stronger base than ethoxide ion.
• B. phenoxide ion is stabilized by resonance.
• C. ethoxide ion is stabilized by resonance.
• D. phenoxide ion is aromatic while ethoxide ion is aliphatic.

Answer 1

The correct option is B phenoxide ion is stabilized by resonance.

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.

Option B is correct.