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Natural rubber has :...

Natural rubber has `:`

A

alternate cis-and trans-configuration

B

random cis - and tran-configuration

C

all cis- configuration

D

all trans-configuration

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The correct Answer is:
C
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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

PRADEEP-POLYMERS-Competition Focus (JEE (main and Advanced) /Medical Entrance Special) (I. Multiple Choice Questions) (with one Correct Answer)
  1. Caprolactam is used for the manufacture of :

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  2. Nylon is an example of

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  3. Which of the following polymers contains nitrogen ?

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  4. Which one of the following structures represents nylon-6,6 polymer?

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  5. Which one of the following is an example of thermosetting polymer ?

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  6. The monomer used in novolac, a polymer used in paints .

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  7. Bakelite is obtained from phenol by reaction with:

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  8. Natural rubber has :

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  9. On complete hydrogenation, natural rubber produces

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  10. Which of the following is not a condensation polymer?

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  11. Which is the monomer of neoprene in the following?

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  12. Which of the following structures represents neoprene polymer?

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  13. Which one of the following statements is not true ?

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  14. Which of the following statements is not correct ?

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  15. Struchures of some common polymers are given. Which one is not correct...

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  16. Buna-N synthetic rubber is a copolymer of:

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  17. Polymer used in bullet proof glass is:

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  18. Which of the following is a biodegradable polymer ?

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  19. Which one of the following sets forms biodegradable polymer?

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  20. Biodegradable polymer which can be produced from glycine and aminocapr...

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