Multiple choice

In the following question there are two statements, Assertion (A) and Reason (R), consider both the statements independently and mark your answers as under:

  1. If both A and R are correct and R is correct explanation of A.
  2. If both A and R are correct and R is not correct explanation of A.
  3. If A is correct and R is incorrect.
  4. If A is incorrect and R is correct.
  5. If both A and R are incorrect. Assertion (A) : Natural rubber is a cis - 1, 4 - polyisoprene. Reason (R) : On vulcanization, rubber becomes softer.

  1. 1

  2. 2

  3. 3

  4. 4

  5. 5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Assertion statement is true, but reason statement is false. 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.

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