(A) In natural rubber, the polyisoprene chains exist as coiled structure.
(R) In polyisoprene Cis-configured chains are held together by weak Vander waals interactions.

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

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

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

Cis-Polyisoprene has a coiled structure in which the various polymer chains are held together by weak van der Waals forces of attraction.
Due to this weak van der waal's forces of attraction the polymer gets stretched when the external force is applied and returns to original state when the force is withdrawn.
So, both (A) and (R) are true and (R) is the correct explanation of (A).

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