Question

Which of the following is a natural polymer?
A.Bakelite
B.Cellulose
C.PVC
D.Neoprene

Answer 1

Hint: As the name suggests natural polymers are substances which are obtained naturally. Our body is also made up of polymers. Natural polymers can be extracted from animals and insects also like silk.

Complete step by step answer:
Polymers are substances which consist of very large molecules which are also called macromolecules. These are composed of repeating subunits. Polymers are of two types. One is a natural polymer and the other is a synthetic polymer.
Bakelite is polyoxybenzylmethylenglycolanhydride. It is the first plastic made from synthetic components. It is formed from the condensation reaction of phenol with formaldehyde.
Cellulose is an organic compound. It is a polysaccharide which consists of a linear chain of many $\beta $-D-glucose units. It is an important structural component of the primary cell wall of green plants and algae. It is the most abundant natural organic polymer on earth.
PVC is polyvinyl chloride. It is a synthetic plastic polymer. It is the third most widely used synthetic polymer.
Neoprene comes from a family of synthetic rubbers. It is formed by polymerization of chloroprene. Polymerization is the process of combining small molecules known as monomers into covalently bonded networks. In this process some chemical groups may be lost from monomers.
Based on the above definitions cellulose is our natural polymer so our answer is option B: cellulose.
Additional information: Methods of making synthetic polymers are generally divided into two categories that are Chain polymerization and Step growth polymerization.
Chain growth polymerization is a technique of polymerization where unsaturated monomers are added onto the active sites of the growing polymer chain one at a time.
Step growth polymerization is a type of polymerization in which bifunctional or multifunctional monomers react to form first dimer, then trimmers, longer oligomers and eventually long chain polymers.

Note: You can remember natural polymers simply by terms which are used for plant components and our body such as cellulose, DNA etc. Natural polymers can’t be obtained artificially.