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Given below are two statements, one is A...

Given below are two statements, one is Assertion (A) and other is Reason (R).
Assertion (A) : Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties
Reason (R): The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with coiled structure.
In the light of the above statements, choose the correct one from the options given below:

A

Both (A) and (R) are true and (R) is the correct explanation of (A).

B

Both (A) and (R) are true but (R) is not the correct explanation of (A).

C

(A) is true but (R) is false.

D

(A) is false but (R) is true.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate the two statements: the Assertion (A) and the Reason (R). ### Step 1: Analyze the Assertion (A) The assertion states that "Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties." - **Explanation**: Natural rubber is indeed a polymer made from isoprene units. The structure of natural rubber is primarily composed of cis-polyisoprene, where the isoprene monomers are linked together in a head-to-tail fashion. The elastic properties of natural rubber arise from its ability to stretch and return to its original shape due to the coiled structure of the polymer chains. - **Conclusion**: The assertion is **True**. ### Step 2: Analyze the Reason (R) The reason states that "The cis-polyisoprene molecules consist of various chains held together by strong polar interactions with coiled structure." - **Explanation**: While it is true that cis-polyisoprene has a coiled structure, the statement about "strong polar interactions" is misleading. Natural rubber is primarily non-polar, and the chains are held together by weak van der Waals forces rather than strong polar interactions. The elasticity of rubber is due to the random coiling of the polymer chains, which allows them to stretch and return to their original state. - **Conclusion**: The reason is **False**. ### Final Evaluation - Since the assertion is true and the reason is false, the correct conclusion is that the assertion is true but the reason is false. ### Answer The correct option is that Assertion (A) is true, and Reason (R) is false. ---
To solve the question, we need to evaluate the two statements: the Assertion (A) and the Reason (R). ### Step 1: Analyze the Assertion (A) The assertion states that "Natural rubber is a linear polymer of isoprene called cis-polyisoprene with elastic properties." - **Explanation**: Natural rubber is indeed a polymer made from isoprene units. The structure of natural rubber is primarily composed of cis-polyisoprene, where the isoprene monomers are linked together in a head-to-tail fashion. The elastic properties of natural rubber arise from its ability to stretch and return to its original shape due to the coiled structure of the polymer chains. - **Conclusion**: The assertion is **True**. ...
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