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Q.

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

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a

phenoxide ion is more stable than ethoxide

b

phenoxide ion is bulkier than ethoxide

c

phenoxide ion is stronger base than ethoxide

d

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