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  4. CO 2 is liberated on adding sodium carbonate to a carboxylic acid. The carbon of CO 2 comes from

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Q. $CO _{2}$ is liberated on adding sodium carbonate to a carboxylic acid. The carbon of $CO _{2}$ comes from

AIIMSAIIMS 2000Aldehydes Ketones and Carboxylic Acids

Solution:

Carboxylic acids react with carbonates forming corresponding salts thus evolution of $CO _{2}$ must be from carbonates.
$2 R C O O H+N a_{2} C O_{3} \rightarrow 2 R C O O N a+H_{2} O+C O_{2} \uparrow$