Question

What is the monomer unit of natural rubber?
(A) Isoprene
(B) Ethene
(C) Neoprene
(D) Tetrafluoro ethene

Answer 1

Hint: To solve this question, we will refer to the polymeric and monomeric units, as we know that monomers are basically the building blocks of protein which forms the basic unit of polymers.

Complete answer:
We have been provided with natural rubber,
We need to find the monomer of natural rubber,
So, for that:
Firstly, we know that monomers are bind together to form a repeating long chain molecules,
This process is basically known as polymerization,
Now, we have been given the natural rubber,
So, we know that natural rubber is a polymer which means that it is a long chain like molecule that contains repeating subunits,
The structure of natural rubber is as follows:

We know that the chemical name of natural rubber is polyisoprene,
And the repeating units in polymer natural rubber is isoprene,
Isoprene is the monomer of the polymer natural rubber,
Isoprene is also known as 2-methyl-1,3-butadiene, which is a colourless volatile liquid, it is an unsaturated hydrocarbon,
So, we can say that the monomer of natural rubber is isoprene,

So, from this we can say that the correct option is (A).

Note:
isoprene or 2-methyl-1,3-butadiene has certain applications too, as it is a colourless, volatile liquid hydrocarbon obtained in processing petroleum or coal tar and used as a chemical raw material.