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Identify the product B in the reaction chain shown.(a) Ethanoic acid(b) Propanoic acid(c) Butanoic acid(d) 2-Methylpropanoic acidThis 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

Answer» 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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