Final answer:
In a condensation reaction, the functional groups formed from an acid anhydride and an alcohol, or an alcohol and a carboxylic acid are Esters. When an amine reacts with a carboxylic acid, or an acyl chloride reacts with an amine, the functional group formed is an Amide.
Step-by-step explanation:
The functional group formed from the condensation reaction of an acid anhydride and an alcohol is an Ester. When an alcohol and a carboxylic acid react, the functional group formed is also an Ester. The condensation reaction between an amine and a carboxylic acid leads to the formation of an Amide. Similarly, when an acyl chloride reacts with an amine, the functional group formed is an Amide.