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Natural rubber has :...

Natural rubber has `:`

A

All trans-configuration

B

Alternate cis-and trans-configuration

C

Rendom cis-and trans-configuration

D

All cis-configuration

Text Solution

Verified by Experts

The correct Answer is:
D
The repeating unit in natural rubber has the cis-configurations with chain extensions on the same side of the ethylene double bond. Which is essential for elasticity. If the configuration is trans, the polymer is either a hard plastic or a substance like gutta-percha.

Natural rubber All cis-configuration
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Explore conceptually related problems

Natural rubber is:

Natural rubber is

Natural rubber is

Rubber is a naturally occurring polymer, which is a linear polymer of isoprene. It can be easily deformed but regains its original shape after the stress is relieved. The properties of natural rubber can be modified and improved by process of vulcanization. It is mixed with 3 to 5% sulphur and heated at 373-423 K. This forms cross links through disulphide bonds (-S-S-) , which make rubber hard, tough with greater tensile strength. There are many different formulations of synthetic rubbers. These are copolymers in which one of the monomer is isoprene. Some common examples are neoprene rubber, Buna-S, Buna-N, etc. Does natural rubber has cis- or trans-configuration about the double bonds?

Assertion : 1, 3-Butadiene is the monomer of natural rubber Reason : In natural rubber, the monomers are linked by cationic polymerisation

Knowledge Check

  • Natural rubber is:

    A
    All-trans polyisoprene
    B
    Chloroprene
    C
    Buna-`S`
    D
    All-cis polyisoprene

  • Natural rubber is a

    A
    polyester
    B
    polyamide
    C
    polyisoprene
    D
    ALL CIS-polysaccharide

  • Natural rubber is:

    A
    Polyisoprene
    B
    Polyvinyl chloride
    C
    Polychloroprene
    D
    Polyfluoroethylene