Question

Which of the following is a natural polymer?
A.Poly butadiene styrene
B.Poly butadiene
C.PolyButadiene acrylonitrile
D.Cis-$1,4$ polyisoprene

Answer 1

Polymer is the large macromolecule consisting of a small repeating unit. These small repeating units are called monomers. These are classified into two types based on the occurrence and preparation of polymers. One is artificial or synthetic polymers and the other is natural polymers.

Complete answer:
Polymers were mainly classified into two types. They are synthetic polymers and natural polymers. Synthetic polymers are also known as artificial polymers. These are derived from the fossil fuels or these polymers can be man-made and prepared in the laboratory by combining the large number of small repeating units. Natural polymers occur in nature and are prepared from plants and animals.
In the given options poly butadiene styrene is an artificial polymer as the repeating unit of butadiene and styrene gives this polymer.
Poly butadiene is an artificial polymer formed from the repeating unit of butadiene.
Poly Butadiene acrylonitrile is an artificial polymer formed from the repeating unit of butadiene and acrylonitrile.
Cis-$1,4$ polyisoprene is the natural polymer as the repeating unit is isoprene. Isoprene occurs from plants and animals.
Option D is the correct one.

Note:
Isoprene is the $2$-methyl $1,3$ butadiene. It is an unsaturated hydrocarbon and colourless volatile liquid. It occurs mainly from plants and animals. Humans also produce this isoprene. It is the main constituent of natural rubber; it is considered as the building blocks of polymers.