Problem 5 - Entrance Test

Which functional group is present in ethanol (CH3CH2OH)?

A. Aldehyde group (-CHO)B. Ketone group (>C=O)C. Carboxyl group (-COOH)D. Hydroxyl group (-OH)

Correct: D

Ethanol is an alcohol. The characteristic functional group of alcohols is the hydroxyl group (-OH) attached to an alkyl group.