Which of the following statements is/are true for natural rubber?

Natural rubber is cis 1,3-polyisoprene

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Hydrocarbons of natural rubber and gutta percha have the same elementary formula

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It becomes sticky at a high temperatures

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After vulcanisation, it becomes soft and more flexible

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Solution

The correct options are
B Hydrocarbons of natural rubber and gutta percha have the same elementary formula
C It becomes sticky at a high temperatures
a) Natural rubber is cis 1,4-polyisoprene.
b) The monomer of both natural rubber and gutta percha is isoprene. So hydrocarbons of both natural rubber and gutta percha have the same elementary formula.
c) It becomes sticky at a high temperature.
d) After vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus, the rubber becomes hard.

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Q21. Consider the following statements related to Natural Rubber production in India.

1. India is world’s third largest natural rubber producer after Indonesia and Brazil.

2. Sikkim is the biggest producer of the rubber in India.

3. The most important condition for the growth of rubber tree is low temperature.

Which of the above statement(s) is/are correct?

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