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Identify the product B in the reaction chain shown.

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in Chemistry – Class 12 by (188k points)
Identify the product B in the reaction chain shown.

(a) Ethanoic acid

(b) Propanoic acid

(c) Butanoic acid

(d) 2-Methylpropanoic acid

This question was addressed to me in my homework.

Question is taken from Methods of Carboxylic Acids Preparation in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Right option is (b) Propanoic acid

The best explanation: Ethyl bromide on reaction with alc. KCN gives ethyl cyanide by nucleophilic substitution. Nitriles can be hydrolysed to give amides and on further heating give a carboxylic acid which contains one more carbon than the original ethyl bromide. Hence, the acid contains three C atoms, making it propanoic acid.

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