A) styrene
B) styrene and 1, 3-butadiene
C) tetrafluoroethylene
D) 2-methyl 1, 3-butadiene
E) 3-methyl 1, 2-butadiene
Correct Answer: D
Solution :
Natural rubber is a hydrocarbon polymer built up from the monomer isoprene as: \[\underset{isoprene\text{ }(2-methyl1,\text{ }3-butadiene)}{\mathop{\overset{1}{\mathop{nC{{H}_{2}}}}\,=\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{^{2}C}}\,{{-}^{3}}CH{{=}^{4}}C{{H}_{2}}}}\,\]\[\xrightarrow[(1,\text{ }4-addition)]{polymerisation}\] \[\underset{natural\text{ }rubber}{\mathop{{{\left[ -C{{H}_{2}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,=CH-C{{H}_{2}}- \right]}_{n}}}}\,\]
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