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What is the IUPAC nomenclature of isopre...

What is the IUPAC nomenclature of isoprene molecular present in natural rubber?

A

2-Methyl-1, 3-butadiene

B

1, 3-Hexadiene

C

2, 3-Dimethyl-1, 3-butadiene

D

2-Methyl-1, 3-pentadiene

Text Solution

Verified by Experts

The correct Answer is:
A
`CH_(2)=underset(CH_(3))underset("| ")"C "-CH=CH_(2):"2 - Methylbut -1, 3 - diene"`
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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. What is the structure and IUPAC name of monomers of natural rubber?

The moleculear formula of monomer (isoprene) present in natural rubber is C_(5)H_(8) . Its on reductive ozonolysis gives two moles of formaldehyde and one mole of 2-oxoproponal. IUPAC name of the monomer is

MODERN PUBLICATION-POLYMERS-Competition file (OBJECTIVE TYPE QUESTIONS) (B. MULTIPLE CHOICE QUESTIONS) (JEE (MAIN) & OTHER STATE BOARDS FOR ENGINEERING ENTRANCE)
  1. Which of the following is not a biodegradable polymer?

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

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  3. Protein is a polymer made of

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  4. What is the IUPAC nomenclature of isoprene molecular present in natura...

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  5. The formation of which of the following polymers involves hydrolysis r...

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  6. Which of the following is a polyamide?

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  7. Among the following, the branched chain polymer is

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  8. Ziegler-Natta catalyst is used to prepare

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  9. The polymer containing five methylene groups in its repeating unit is

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  10. Cis-1, 4 polyisoprene is known as

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  11. The polymers which does not become soft on heating and cannot remould ...

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  12. Which of the following polymers does not involve cross-linkages ?

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  13. Which in the correct structure of Nylon-6

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  14. Which of the following is a condensation polymer?

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  15. Which of the following is a thermosetting polymer?

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  16. The homopolymer formed from 4-hydroxybutanoic acid is :

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  17. The two monomers for the synthesis of Nylon 6,6 are :

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  18. Monomer of [NH-overset(O)overset(||)C-NH-CH(2)]n is:

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  19. The correct match between Item-I and Item-II is :

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  20. Poly -beta - hydroxybutyrate - co-beta - hydroxyvalerate (PHBV ) is a...

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