Q.

Phenol is better Bronsted acid than Cyclohexanol because

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a

Phenol forms stable phenoxide ion, which is stabilized by resonance effect.

b

Conjugate base of Phenol is less stable than conjugate base of cyclohexanol.

c

The phenyl group is an electron-donating group by induction, which stabilizes the anion formed in the reaction.

d

None of the above.

answer is A.

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Detailed Solution

→Acidic strength of acid is directly proportional to stability of its conjugate base

→Conjugate base of Phenol (phenoxide) is more stable than conjugate base of alcohol (alkoxide). This is due to resonance stabilization of phenoxide. Hence Phenol is more acidic than alcohol.

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