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Which one between phenol and cyclohexano...

Which one between phenol and cyclohexanol is more acidic and why?

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Phenol is a stronger acid than cyclohexanol. It can be explained as follows-
(i) Due to resonance, the O - atom of OH group acquires a + ve charge and so release of proton is faciliated :

(ii) When phenol ionises, the formed phenoxide ion is also a resonance hybrid, but it is more stabilised by resonance than unionised phenol molecule because of spreading of a negative charge only. In the unionised molecule resonance involves separation of charge.

Such effects are not possible in case of cyclohexanol and hence release is not facilitated.
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