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The compound that does NOT liberate CO2, on treatment with aqueous sodium bicarbonate solution, is 

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The compound that does NOT liberate CO2, on treatment with aqueous sodium bicarbonate solution, is 

(A) Benzoic acid 

(B) Benzenesulphonic acid 

(C) Salicylic acid 

(D) Carbolic acid (Phenol)

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(D) Carbolic acid (Phenol)

pKa of PhOH (carbolic acid) is 9.98 and that of carbonic acid (H2CO3) is 6.63 thus phenol does not give effervescence with HCO\(^-_3\) ion.

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