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Question

Which class of organic compounds give effervescence with NaHCO3 solution?

A
Esters
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B
Alcohols
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C
Carboxylic acids
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D
Aldehydes
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Solution

The correct option is D Aldehydes
Only carboxylic acids react with metal carbonates and produce their corresponding metal salts along with carbon dioxide and water. The effervescence is due to carbon dioxide.

For example,

NaHCO3(aq) + CH3COOH(l) CH3COONa(aq) + H2O(l) + CO2(g)Sodium Acetic acid Sodium acetate Water Carbon dioxide bicarbonate

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