Question

Monomer of Polypropene/Polypropylene is:
A.Propane
B. Propene
C. Propyne
D. Prop- $1,2$ -diene

Answer 1

Hint: Propene and propylene are the names of the same molecule. Addition polymers are names on the basis of their monomers, usually they only have one monomer. In this case, the name of the polymer is the monomer with the word poly as a prefix.

Complete step by step answer:
Polymers are molecules which have a high molecular mass and a common repeating unit. This repeating unit can be made up of one starting material or more than one starting material. The starting material in the polymers is known as monomers.
Polymers can be divided on the basis of their monomers , they can be a homopolymer, which means they were made from a single monomer. Or they can be co-polymer which means they were made from two different polymers.
Co-polymers are further classified on the basis of the repeating units and their arrangement with respect to each other.
In these cases the polymers have the name of both the monomers. For example, phenol-formaldehyde resin is a polymer and like the name suggests, its monomers are phenol and formaldehyde.

In case of homopolymers. There is only one monomer which is repeating itself.
Hence, the name of the polymer is the name of the monomer with the word, poly as a prefix to denote its multiplicity .
In the question given to us, polypropene can be broken down as poly and propene.
This means that propene is the monomer for the polymer

So, the correct answer is Option B.

Note: Polymers can also be divided on the basis of the type of reaction they undergo. It could be addition or condensation also. It is not always true, but homopolymers follow addition mechanisms whereas co-polymers follow condensation mechanisms most of the time.