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Question

Among the following compounds, the one(s) that gives (give) effervescence with aqueous NaHCO3 solution is (are)
(CH3CO)2OCH3COOHPhOHCH3COCHOIIIIIIIV

A
I and II
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B
I and III
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C
Only II
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D
I and IV
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Solution

The correct option is D I and II
Only carboxylic acids and their derivatives like anhydride are capable to give effervescence with aqueous NaHCO3 solution, because they are more acidic as compared to H2CO3 (carbonic acid).
CH3COOH+NaHCO3CH3COONa+H2O+CO2
(CH3CO)2O+2NaHCO32CH3COONa+H2O+CO2

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