Question:

Natural rubber has :

Updated On: Apr 20, 2025

All trans-configuration
Alternate cis- and trans-configuration
Random cis- and trans-configuration
All cis-configuration

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The Correct Option is D

Solution and Explanation

The correct answer is:

Option 4: All cis-configuration

Explanation:

Natural rubber is primarily made of polyisoprene, which is a polymer composed of repeating units of isoprene (C₅H₈). The structure of natural rubber has all cis-configuration at the double bonds in the polymer chain. This means that the substituents (methyl groups) are on the same side of the polymer backbone, giving the polymer a flexible, coiled structure.

All cis-configuration: This refers to all of the isoprene units in natural rubber having the same configuration, where the two methyl groups (CH₃) are on the same side of the polymer backbone.

Cis-trans isomerism: While there is also trans-configuration, which has the methyl groups on opposite sides, natural rubber specifically has all cis-configuration in its polymer chain, which contributes to its flexibility and elasticity.

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Concepts Used:

Types of Polymerization Reactions

Polymerization is a chemical reaction in which a large number of monomer molecules combine to produce a polymer. A polymerization can yield macromolecules with a linear or branching structure. They can also take the form of a three-dimensional complicated network.

Types of Polymerisation

Polymerization reactions are divided into two groups, namely, Addition polymerization (chain reaction) and condensation reaction (step reaction).

Addition Polymerisation: As the name denotes, we can see the addition of monomers to form a polymer, twice the number or even more than that. Here, we can either select monomers of the same species or of different species. When we choose the single species monomers for the polymerization, the product thus formed is known as homopolymer (for example polythene used to make bags). When we use two different species for additional polymerization, the polymer would be known as copolymer (for example, Buna-S and Buna-N).
Condensation Polymerisation: In the condensation polymerisation, we can find elimination of compounds like HCL, water, alcohol etc...; while the monomers condense during the reaction process. This reaction happens between tri-function and bi-function monomer units and results in the formation of polymers like nylon.