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Q.

(A) The pka of acetic acid is lower than that of phenol. 
(R) Phenoxide ion is more resonance stabilised than acetate ion.

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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 the correct explanation of (A)

c

(A) is true but (R) is false

d

Both (A) and (R) are false

answer is C.

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Detailed Solution

Carboxylate ion has two equal resonating structures and negative charge is on oxygen.while phenoxide has more resonating structures but negative charge is on carbon hence carboxylate ion is more stable than phenoxide ion.Therefore carboxylic acids are  more acidic than phenols. 

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(A) The pka of acetic acid is lower than that of phenol. (R) Phenoxide ion is more resonance stabilised than acetate ion.