Question

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

• A. Phenoxide ion is bulkier than ethoxide
• B. Phenoxide ion is stronger base than ethoxide
• C. Phenoxide ion is stabilized through delocalization
• D. Phenoxide ion is less stable than ethoxide

Hint:

Greater stability of conjugate base implies stronger acid.

Answer 1

The Correct Option is C

Step 1: Phenoxide ion has resonance stabilization due to delocalization of negative charge over the aromatic ring.
Step 2: Ethoxide ion has no such resonance stabilization.