Which molecule contains a carboxyl group?

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Multiple Choice

Which molecule contains a carboxyl group?

Explanation:
The carboxyl group is a functional group written as -COOH, consisting of a carbonyl carbon double-bonded to oxygen and single-bonded to a hydroxyl group. This combination is what defines carboxylic acids. Ethanoic acid contains this -COOH group, so it has the carboxyl group. Ethanol has a hydroxyl group (-OH) but not the carboxyl arrangement, ethene has a carbon-carbon double bond (alkene), and propane is a simple alkane with only C–H and C–C bonds.

The carboxyl group is a functional group written as -COOH, consisting of a carbonyl carbon double-bonded to oxygen and single-bonded to a hydroxyl group. This combination is what defines carboxylic acids. Ethanoic acid contains this -COOH group, so it has the carboxyl group. Ethanol has a hydroxyl group (-OH) but not the carboxyl arrangement, ethene has a carbon-carbon double bond (alkene), and propane is a simple alkane with only C–H and C–C bonds.

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