Question
Chemistry Question on Mole concept and Molar Masses
Which of the following statements about natural rubber is true?
A
(A) It is a polymer of 2,2-dimethyl-1,3-butadiene (isoprene).
B
(B) On an average, it contains about 5000 isoprene units.
C
(C) All double bonds in natural rubber are trans.
D
(D) Gutta-percha is a naturally occurring isomer of rubber in which all the double bonds are cis.
Answer
(B) On an average, it contains about 5000 isoprene units.
Explanation
Solution
Explanation:
Natural rubber is a linear polymer of 2-methyl-1,3-butadiene (isoprene). It is also called cis-1,4-polyisoprene. On an average, it contains 5000 isoprene units. All the double bonds in natural rubber are cis.