Identify carboxylic acid which is present in Vinegar
Correct answer: B. ethanoic acid
- A. citric acid
- B. ethanoic acid
- C. oxalic acid
- D. methanoic acid
Explanation
The common names of carboxylic acids were derived from the source from which they are isolated. The irritation caused by an ant bite is due to formic acid (Latin word formica, ant). It was first isolated by the distillation of red ants. Similarly acetic acid was first isolated from vinegar and butyric acid was named after butyrum means butter.
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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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