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Final answer:The reaction of butanoic acid with ethanol produces ethyl butanoate (A), as a result of an esterification reaction where a carboxylic acid and an alcohol react to form an ester and water.Explanation:The reaction of butanoic acid with ethanol produces ethyl butanoate and water. This type of reaction is an esterification reaction, where a carboxylic acid reacts with an alcohol to form an ester and water. The ester that is formed when butanoic acid reacts with ethanol is called ethyl butanoate, therefore the answer to the question is (A) ethyl butanoate. The esterification process is represented by the following general equation:Carboxylic Acid (R-COOH) + Alcohol (R'-OH) ⇒ Ester (R-COOR') + Water (H2O)In the specific case of butanoic acid reacting with ethanol, the reaction would be:Butanoic Acid (CH3CH2CH2COOH) + Ethanol (CH3CH2OH) ⇒ Ethyl Butanoate (CH3CH2CH2COOCH2CH3) + Water (H2O)...