Ebonite is:A) PolypropeneB) Natural rubberC) Synthetic rubberD) Highly vulcanized rubber

Ebonite is best described as D) Highly vulcanized rubber.

Explanation:
What is Ebonite?

Ebonite is a hard, black, rubber-like material made by the prolonged vulcanization of natural rubber. It is known for its hardness and excellent electrical insulating properties.
Vulcanization Process:

Vulcanization is a chemical process that involves heating rubber with sulfur, which creates cross-links between polymer chains. This process enhances the strength, elasticity, and durability of the rubber.
Ebonite is subjected to extensive vulcanization, which results in a material that is much harder and more rigid than regular rubber.
Comparison with Other Options:

A) Polypropene: This is a type of plastic (polymer) and not related to rubber.
B) Natural rubber: This is derived from latex obtained from rubber trees, whereas ebonite is a highly processed form of rubber.
C) Synthetic rubber: While ebonite may share some properties with synthetic rubbers, it is specifically categorized as highly vulcanized rubber.
Conclusion:
Thus, ebonite is best classified as highly vulcanized rubber, making D) Highly vulcanized rubber the correct answer.