The ionisation constant (K_a ) of phenol is higher than that of ethanol because

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phenoxide ion is more stable than ethoxide

phenoxide ion is bulkier than ethoxide

phenoxide ion is stronger base than ethoxide

phenoxide ion is less stable than ethoxide

answer is C.

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Detailed Solution

Strong acid always has weak conjugate acid and weak acid always have strong conjugate base. Stronger is the acid, less is the value of K_a. Phenol has higher value of Ka, this means that conjugate base of phenol (phenoxide ion) is more stable than conjugate base of ethanol (ethoxide).

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