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Multiple Choice
Which of the following functional groups is present in all alcohols?
A
Carboxyl group (-COOH)
B
Amino group (-NH2)
C
Carbonyl group (C=O)
D
Hydroxyl group (-OH)
Verified step by step guidance
1
Identify the functional group that characterizes alcohols. Alcohols are organic compounds that contain the hydroxyl group (-OH).
Understand the structure of the hydroxyl group. It consists of an oxygen atom bonded to a hydrogen atom, and this group is attached to a carbon atom in the organic molecule.
Differentiate the hydroxyl group from other functional groups listed: Carboxyl group (-COOH), Amino group (-NH2), and Carbonyl group (C=O). None of these are characteristic of alcohols.
Recognize that the hydroxyl group is responsible for the properties of alcohols, such as their ability to form hydrogen bonds, which affects boiling points and solubility.
Conclude that the presence of the hydroxyl group (-OH) is what defines a compound as an alcohol, distinguishing it from other organic compounds with different functional groups.