A) 2-methyl-1,3-butadiene
B) 2-chloro-1,3-butadiene
C) 2-methoxypropene
D) None of the above
Correct Answer: A
Solution :
\[\underset{isoprene}{\mathop{\overset{1}{\mathop{C}}\,{{H}_{2}}=\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{2}{\mathop{C}}}\,\overset{3}{\mathop{C}}\,H=\overset{4}{\mathop{C}}\,{{H}_{2}}}}\,\] Hence, the chemical name is 2-methyl-1, 3-butadiene and it is a monomer unit of natural rubber.
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