A) \[{{H}_{2}}C=\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]
B) \[{{H}_{2}}C=\overset{\begin{smallmatrix} Cl \\ | \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]
C) \[{{H}_{2}}C=\underset{\begin{smallmatrix} | \\ {{C}_{6}}{{H}_{5}} \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]
D) \[-{{(C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\]
Correct Answer: A
Solution :
Natural rubber is a polymer of 2-methyl-1, 3 butadiene (isoprene) so, its structure is\[{{H}_{2}}C=\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}\,-CH=C{{H}_{2}}\]
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