MCAT Biology : Reactions with Carboxylic Acids

Study concepts, example questions & explanations for MCAT Biology

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Example Questions

Example Question #5 : Reaction Types

Compound B is dissolved in methylene chloride, and then treated with trifluoroacetic acid. Over the next thirty minutes, gas evolution was observed from the reaction mixture. What gas was being given off?

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Possible Answers:

\(\displaystyle O_2\)

\(\displaystyle CO\)

\(\displaystyle CO_2\)

\(\displaystyle NH_3\)

\(\displaystyle HON_2\)

Correct answer:

\(\displaystyle CO_2\)

Explanation:

Treatment of a carboxylic acid with acid results in decarboxylation, and the evolution of \(\displaystyle CO_2\), especially if the resulting compound contains a benzylic or allylic carbon, as is the case here.

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