Which of the following compounds, in the form of aqueous solution, on reaction with sodium carbonate will produce carbon dioxide gas?
Correct answer: C. H3C2-CO-OH
- A. H3C-COO-C2H5
- B. H3C2-COO-CH3
- C. H3C2-CO-OH
- D. H3C2-COO-C2H5
Explanation
A is incorrect as the compound given is an ester which does not produce carbon dioxide upon reaction with sodium carbonate.B is incorrect as it is also an ester,hence it also doesnt produce carbon dioxide upon reaction with sodium carbonate.C is correct as the compound given is a carboxylic acid,it produces carbon dioxide upon reaction with sodium carbonate.D is incorrect as the given compound is unreactive with sodium carbonate.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Reactivity of Carboxylic Acids
Carboxylic acids show acidic behaviour because their carboxylate ions are resonance-stabilised, and electron-withdrawing groups can change their strength. Reactions include neutralisation, esterification, formation of acid chlorides and amides, reduction, decarboxylation and substitution at the acyl carbon, which differs from the reactions of phenols.
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