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COMEDK2012ChemistryGeneral Organic Chemistry

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

Options

  1. Aphenoxide ion is a stronger base than ethoxide ion
  2. Bphenoxide ion is stabilised by resonance
  3. Cethoxide ion is stabilised by resonance
  4. Dphenoxide ion is aromatic while ethoxide ion is aliphatic

Correct answer

B. phenoxide ion is stabilised by resonance

Step-by-step solution

Ionisation constant (K_ a ) of phenol is more than that of ethanol because phenol is more acidic than alcohol. On ionisation, phenol gives phenoxide ion which is stabilised due to resonance.

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