Functional Groups

An amide linkage is a functional group with the general formula . It consists of a carbonyl group ( ) attached to a nitrogen atom ( ).
Step 1: Identify compounds with an amide group - Acetanilide: Acetanilide contains the amide functional group. The structure consists of an aniline (amine group) attached to an acetyl group ( ) forming the amide bond. - Aspirin: Aspirin contains an ester linkage, not an amide. It has a carboxyl group and an ester functional group. - Benzene: Benzene is a hydrocarbon and does not contain any functional group like an amide. - Acetic acid: Acetic acid contains a carboxyl group ( ), not an amide.
Step 2: Conclusion From the analysis above, we conclude that Acetanilide contains an amide linkage. Thus, the correct answer is .