A) styrene
B) chloroprene
C) \[C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\] or isoprene
D) 1, 3-butadiene
Correct Answer: C
Solution :
The commercial natural -rubber is obtained from the tree Hevea brasiliensis. Natural rubber is found to be a polymer of cis-isoprene. \[C{{H}_{2}}=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,CH=C{{H}_{2}}\] Hence, it is a polymer of cis-isoprene.
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