Final answer:
Carboxyl and Hydroxyl functional groups are used to form polymers via dehydration reactions.
Step-by-step explanation:
The functional groups that may be used to form polymers via dehydration reactions are Carboxyl and Hydroxyl.
In dehydration synthesis, monomers combine to form polymers by releasing a molecule of water. Carboxyl and Hydroxyl groups both have the necessary atoms to contribute to the formation of the polymer and create the water molecule as a byproduct.