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Polymer Science and Technology
Assertion: Natural rubber is a cis-1,4-polyisoprene.
Reason: On vulcanization, rubber becomes softer.
Directions: In the following question there are two statements, Assertion (A) and Reason (R), consider both the statements independently and mark your answers as under:
A and R both are correct and R is correct explanation of A.
A and R both are correct and R is not correct explanation of A.
A is correct and R is incorrect.
A is incorrect and R is correct.
A and R both are incorrect.
Both assertion as well as reason statement is true.
Natural rubber may be considered as a linear polymer of isoprene (2-methyl-1, 3 butadiene) and is also called as cis-1, 4-polyisoprene.
On vulcanization, sulphur forms cross links at the reactive sites of double bonds and thus, the rubber gets stiffened.
Thus, this option is correct.