What is an oligomer?

• A. Long chain of polymers
• B. Short chain of monomers
• C. A type of gel
• D. A polymer composite

Answer: (B)

An oligomer is defined as a molecule that consists of a relatively small number of repeating monomer units. Typically, oligomers are formed through a process known as polymerization, but unlike true polymers, which can have a very long chain of repeating units, oligomers contain a short chain of monomers, usually ranging from two to ten units. This specific structure gives oligomers unique properties that differ from long-chain polymers, making them significant in various chemical and industrial applications, including in the preparation of resins and adhesives.

The other options suggest variations or types of compounds that do not accurately describe an oligomer. Long chains of polymers would refer to fully polymerized substances with many repeating units, which is not the case for oligomers. A type of gel may be produced from oligomers, but it does not define what an oligomer is. Lastly, a polymer composite implies a material made from blending polymers with other materials or additives, which again does not capture the essence of what an oligomer is. Hence, defining oligomers by their short chains of monomers is the most accurate representation.