Question

Which of the following is incorrect regarding natural rubber?
A.It is cis-polyisoprene
B.It is amorphous in nature
C.It has syndiotactic stereochemistry
D.Molecules of rubber have coiled conformation

Answer 1

India rubber, latex, Amazonian rubber, caucho or caoutchouc are all the other names of natural rubber. Natural rubber comprises polymers of the organic compound isoprene.

Complete answer:
Natural rubber is produced by the polymerization of isoprene which is also named as 2-methyl-1,3-butadiene. It also contains water and minor impurities of the other organic compounds. Isoprene has a chemical formula of ${\left( {{C_5}{H_8}} \right)_n}$. Hence natural rubber is called as cis-1,4-polyisoprene. Simply, we can say that natural rubbers are made by slackly linking together the monomers of isoprene in the form of a long coiled or tangled chain.
Elastomers are the types of polyisoprene which are utilized as natural rubbers.
Largely, rubber is reaped from the rubber trees or others in the form of latex. The latex is a sticky, milky colloid drained off by incising on the barks.
Natural rubber is thermoplastic and is majorly used in many products and applications. It can be used alone or as a mixture with other materials. Natural rubber possesses a large stretch ratio and high resilience. It is tremendously waterproof. It has an amorphous nature.
The way in which all the configurational or the repeating units are arranged at the backbone chain of a polymer is known as tacticity. Natural rubber owns isotactic stereochemistry and not syndiotactic stereochemistry.

Therefore, the correct option is C.

Note:
Rubber is beneficial for so many things such as the cement, adhesive or insulating or friction tapes, footwear, vehicle tires, conveyor belts, pump housings and pipes, etc.