When CO2 is made to react with ethy1 magnesium iodide in dry ether followed by acid hydrolysis yields______________?
Correct answer: C. Propanoic acid
- A. Carboxylic acid
- B. Ethanoic acid
- C. Propanoic acid
- D. Butanoic acid
Explanation
A Grignard reagent reacts with carbon dioxide to form a magnesium carboxylate, and acid hydrolysis gives a carboxylic acid with one extra carbon atom. Ethyl magnesium iodide, C2H5MgI, therefore gives C2H5COOH, which is propanoic acid. Ethanoic acid is the likely distractor because it would result from a methyl, not ethyl, Grignard reagent.
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About Nomenclature, Structure and Preparation
Carboxylic acids are prepared by oxidising primary alcohols or aldehydes, hydrolysing nitriles, esters and amides, and carbonating suitable organometallic compounds. Their structures, IUPAC naming, resonance stabilisation and acidic character explain why carboxylic acids differ from alcohols and phenols, despite all containing oxygen and hydrogen.
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