What are the main constituents of organic polymers, such as plastics?

• A. Carbon and oxygen
• B. Carbon and hydrogen
• C. Hydrogen, carbon and chlorine
• D. Carbon, oxygen, and chlorine

Answer: (B)

The main constituents of organic polymers, such as plastics, are primarily carbon and hydrogen. Organic polymers are macromolecules composed of long chains of repeating units called monomers, which often contain these two elements. The carbon atoms form the backbone of the polymer chains, and hydrogen atoms are typically attached to the carbon atoms. This structure is fundamental to the properties of plastics, influencing characteristics like flexibility, strength, and durability.

While other elements like oxygen and chlorine can be present in some specific types of polymers or additives, they are not the primary building blocks for the vast majority of organic polymers. For example, some plastics may have chlorine (like PVC) or oxygen (as seen in polyesters), but these are not the main constituents in the broad category of organic polymers. Thus, the focus on carbon and hydrogen captures the essence of what constitutes the majority of organic polymer structures.