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Question

The compound that does not liberate CO2 on treatment with aqueous sodium bicarbonate solution is what?

A
Benzoic acid
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B
Carbolic acid(Phenol)
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C
Salicylic acid
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D
none
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Solution

The correct option is D Carbolic acid(Phenol)
pKa of phenol (carbolic acid) is 9.98 and that of carbonic acid (H2CO3) is 6.63, thus phenol does not give effervescence with HCO3 ion.

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