Which of the following functional groups contains nitrogen?

• A. Ketone
• B. Amine
• C. Carboxylic acid
• D. Alcohol

Answer: (B)

Verified step by step guidance

1. Identify the structure of each functional group listed: ketone, amine, carboxylic acid, and alcohol.
2. Recall that a ketone contains a carbonyl group (C=O) bonded to two carbon atoms, with no nitrogen present.
3. Recognize that an amine contains a nitrogen atom bonded to one or more alkyl or aryl groups, which is the defining feature of this group.
4. Understand that a carboxylic acid contains a carboxyl group (-COOH), which includes carbon, oxygen, and hydrogen, but no nitrogen.
5. Know that an alcohol contains a hydroxyl group (-OH) attached to a carbon atom, and does not contain nitrogen.