1.

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

Answer»

phenoxide ION is bulkjer than ethoxide
phenoxide ion is stronger base than ethoxide
phenoxide ion is STABILIZED through delocalization
phenoxide ion is less stable than ethoxide

Solution :`C_(6)H_(5)+H_(2)O harrC_(6)H_(5)O^(-)+H_(3)O^(+)`
The phenoxide ion is stable due to reasonance.
The negative charge is delocalized in the benzene ring which is a stabilizing factor in the phenoxide ion and because of this REASON ionization constant of phenol is higher whereas no resonance is possible in alkoxide IONS (`RO^(-)`) derived from alcohol. The negative charge is localized on oxygen atom in case of alcohols.


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