Which of the following functional groups is characterized by a $\mathrm{carbonyl}$ group bonded to a $\mathrm{nitrogen}$ atom?

• A. Ether
• B. Aldehyde
• C. Alcohol
• D. Amide

Answer: (D)

Verified step by step guidance

1. Understand the structure of a carbonyl group, which is a carbon atom double-bonded to an oxygen atom. This is often represented as $C=O$.
2. Identify the functional groups listed: Ether, Aldehyde, Alcohol, and Amide. Each has distinct structural features.
3. Recognize that an Ether consists of an oxygen atom connected to two alkyl or aryl groups, represented as $R-O-\mathrm{R\text{'}}$, where $R$ and $\mathrm{R\text{'}}$ are organic groups.
4. Understand that an Aldehyde contains a carbonyl group bonded to a hydrogen atom and an alkyl group, represented as $R-C=O-H$.
5. Recognize that an Amide is characterized by a carbonyl group bonded to a nitrogen atom, represented as $R-C=O-NH\mathrm{R\text{'}}$, where $R$ and $\mathrm{R\text{'}}$ are organic groups.