Question

Monomer of polythene is:
A.Propene
B.Isoprene
C.Chloroprene
D.Ethene

Answer 1

Hint: We have to find the basic unit of polythene. Monomer is the basic unit which joins n times to make a poly molecule such as polythene. Here, we should carefully observe the options.

Complete step by step answer:
A monomer is a molecule that forms the basic unit for polymers. Monomers bind to other monomers to form repeating chain molecules through a process known as polymerization. Monomers may be either natural or synthetic in origin.
Here, we will know that the ingredient or monomer that is used to make polythene is ethylene (IUPAC name ethene), a gaseous hydrocarbon with the formula$$C_2{H}_4$$, which can be viewed as a pair of methylene groups ($$-C{H}_2-$$) connected to each other.
So our correct option is D
Option A is incorrect because propene is the monomer of poly (propene), often known as polypropylene, which is one of the most versatile thermoplastic polymers available commercially.
Option B is incorrect because Isoprene is the monomer of natural rubber. Isoprene, also called 2-methyl-1,3-butadiene, a colourless, volatile liquid hydrocarbon obtained in processing petroleum or coal tar and used as a chemical raw material. The formula is $$C_5{H}_8$$
In option C, Chloroprene is the common name for the organic compound 2-chlorobutanol-1, 3-diene. It is a colourless liquid and it is the monomer of the polymer poly-chloroprene, a type of synthetic rubber.
Additional information:
We should know that polyethene is of low strength, hardness and rigidity, but has a high ductility and impact strength as well as low friction.
Polyethene is a good electrical insulator. It offers good electrical treeing resistance.

Note: Neoprene or poly-chloroprene rubber was one of the very first synthetic rubbers produced. We should note that it was a material of choice for exterior applications such as profiles used in vehicles, building seals, and cables. Poly (propene) has remarkable properties. These properties include: low density, high stiffness, heat resistance and chemical inertness.