Polymerization of Natural Rubber

Natural rubber is a polymer of isoprene monomers. Here is an explanation of why the correct answer is option B:

Isoprene Monomer

Isoprene is a branched-chain hydrocarbon with the molecular formula C5H8. It has two double bonds, which makes it highly reactive, and it can readily undergo polymerization to form a long chain of repeating units.

Polymerization Reaction

The polymerization reaction of natural rubber occurs via a process called free radical polymerization. This process involves the following steps:

1. Initiation: A free radical initiator, such as peroxide, is added to the reaction mixture to generate free radicals.

2. Propagation: The free radicals react with the isoprene monomers to form a growing polymer chain.

3. Termination: The polymerization reaction is terminated by the combination of two free radicals or by the addition of a chain terminator.

Natural Rubber

The resulting polymer is natural rubber, which is a high molecular weight polymer with a repeating unit of isoprene. Natural rubber has a variety of properties that make it useful in a wide range of applications, including elasticity, flexibility, and resistance to abrasion and tearing.

Conclusion

In summary, natural rubber is a polymer of isoprene monomers that undergo free radical polymerization to form a long chain of repeating units. This process results in a high molecular weight polymer with unique properties that make it useful in a variety of applications.