Which of the following functional groups is commonly found in polyesters?

Which of the following functional groups is commonly found in polyesters?

Step 1: Understand what polyesters are. They are a type of polymer made from repeating units.
Step 2: Know that polyesters are created by a chemical reaction between two types of molecules: diols and dicarboxylic acids.
Step 3: Identify the functional groups involved. Diols contain hydroxyl (-OH) groups, and dicarboxylic acids contain carboxyl (-COOH) groups.
Step 4: Recognize that when these two react, they form ester functional groups (-COO-), which are key components of polyesters.
Step 5: Conclude that the functional group commonly found in polyesters is the ester group.

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