Question

Natural rubber is which type of polymer?
A Condensation polymer
B Addition polymer
C Coordination polymer
D None of these

Answer 1

Hint: Natural rubber is a polymer of monomer, isoprene (2-methyl-1,3-butadiene). Thus, it is also called polyisoprene (unsaturated compound). Natural rubber definitely occurs in nature, obtained as latex (milky fluid white in colour) from a rubber tree. A large number of isoprene link together to give polyisoprene (natural rubber) without co-generation of other products than of its isoprene unit.

Complete Step by Step Solution:
Condensation polymers are those polymers each of which consists of a building block unit (monomer) linked with each other in a complex manner with co-generation of the product. other than its monomer unit like water results in the formation of hetero chain polymer. Thus, it cannot be natural rubber. In this monomers are saturated.

An addition polymer is defined as a polymer formed with the simple linkage of its monomer (smallest unit) or can be said with simple addition (as its name suggests) of monomers in the presence of free radical. In this polymerization, there is no co-generation of any side product like water. The additional polymerization results in the formation of the homo-chain polymer. In this monomers are unsaturated. Thus, natural rubber is an additional polymer.

Whereas coordination polymers are also known as the Ziegler polymerization process because this involves a special catalyst. Coordination polymers are inorganic or organometallic compounds with a metal ion at the centre surrounded by many ligands forming a coordinate bond with a central metal ion which is not the case in natural rubber.
Thus, the correct option is B.

Note: Natural rubber has the property to be stretched thus, also considered an elastomer. Natural rubber is obtained as latex from latex vessels or rubber-producing plants. It is also found that a large number of plants produce latex but only some of them contain rubber in their latex. This means all natural rubber obtained from latex but all latex does not contain rubber.