Question

Which of the following contain isoprene units?
(A)Natural rubber
(B) Polyethylene
(C) Nylon-6, 6
(D) Dacron

Answer 1

Rubber is known to be a natural product and is produced by plants. It is used in our daily lives a lot. It holds an important role in human history as well for the development of human civilizations. We can also see that natural rubber can be extracted from a tree called Hevea brasiliensis. It is produced from plants and can be classified as a polymer.

Complete step-by-step answer: When we talk about polymers, we must know that natural rubber is the one of the most important polymers for human society. Polymers are chemical compounds which have large molecules made up of many smaller molecules and these molecules are of the same kind. Many polymers such as natural rubber are naturally present in nature while some can be produced in labs and factories.
Isoprene is the major unit of rubber. This exists in the form of a chain to produce the product rubber. Rubber is a milky fluid which is white in color and has proteins, starch, alkaloids etc and can be made by many plants. The properties of rubber include being of high strength and having the capability to stretch many times. Rubber is also known to be a good electrical insulator which is why it is used in wires. It is also resistant to corrosive substances.

Note: There are around $20000$ species of plants which form latex but only about $2500$ species have been found to contain rubber in their latex. Rubber is known to have healing properties for plants after that are damaged which is done by covering wounds and stopping the bleeding which has occurred.