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in Alcohols, Phenols and Ethers by (80.8k points)
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Assertion: The pKa of acetic acid is lower than that of phenol.

Reason: Phenoxide ion is more resonance stabilised.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

1 Answer

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Best answer

The correct option is: (c)

Explanation:

Lower the value of pKa, more acidic will be the compound. Acetic acid is more acidic than phenol. This indicates that carboxylate ion should be more stable than the phenoxide ion and it is clear that carboxylate ion has more equivalent resonating structures than the phenoxide ion.

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