Which of the following give effervescence of CO2 with aqueous NaHCO3? (more than one may be correct)

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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si049

Which of the following give effervescence of $CO X_{2}$ with aqueous $NaHCO X_{3}$ ? (more than one may be correct)

A2-hydroxybenzoic acid
Bethanoic acid
Cphenol
D4-nitrophenol

Answer: A, B

Carboxylic acids (pKa about 3 to 5) are stronger than carbonic acid and liberate

CO X_{2}

. Both ethanoic acid and salicylic acid qualify. Phenol and 4-nitrophenol (pKa about 7) are weaker acids than carbonic acid and are not strong enough to give effervescence.

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Which of the following give effervescence of COX2​ with aqueous NaHCOX3​? (more than one may be correct)

Answer: A, B

More questions on Distinguishing tests for functional groups

Which of the following give effervescence of $CO X_{2}$ with aqueous $NaHCO X_{3}$ ? (more than one may be correct)