The IUPAC name of CH3CH2COOH is
Correct answer: C. propanoic acid
- A. ethanoic acid
- B. butanoic acid
- C. propanoic acid
- D. propan-1-ol
Explanation
The molecule has three carbon atoms in total, and the carboxyl carbon is always counted as part of the chain and numbered one, so the name is propanoic acid. Forgetting to count the carboxyl carbon gives ethanoic acid, which is the standard error. The parent acid name is formed by replacing the final e of the alkane with the ending oic acid.
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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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