Which of the following is incorrect regarding natural rubber ?

It is cis-polyisoprene

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It is amorphous in nature

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It has syndiotactic stereochemistry

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Molecules of rubber have coiled conformation

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Solution

The correct option is C It has syndiotactic stereochemistry
Rubber has isotactic stereochemistry, not syndiotactic.

Tacticity refers to the orderliness of succession of configurational repeating units in the main chain of a macromolecule. This is an application of stereochemistry as it concerns the spatial arrangement of substituent groups.

Hence, option C is correct.

Suggest Corrections

Which of the following is not a semisynthetic polymer?

(a) cis-polyisoprene

(b) Cellulose nitrate

(d) Vulcanised rubber

Which of the following are example of synthetic rubber?

(a) Polychloroprene

(b) Polyacrylonitrile

(d) cis-polyisoprene

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