A) \[{{H}_{2}}C=\underset{Cl}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-CH=C{{H}_{2}}\]
B) \[{{H}_{2}}C=\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,-CH=C{{H}_{2}}\]
C) \[\overset{{{C}_{6}}{{H}_{5}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,=C{{H}_{2}}\]
D) \[{{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\]
Correct Answer: A
Solution :
(a) \[{{H}_{2}}C=\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,-CH=C{{H}_{2}}\] is isoprene or 2-methyl 1,3-butadiene. It is monomer of natural rubber (b)\[{{H}_{2}}C=\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,-CH=C{{H}_{2}}\] is chloroprene or 2-chloro 1,3-butadiene is monomer of neoprene. (c)\[{{C}_{6}}{{H}_{5}}CH=C{{H}_{2}}\] is styrene. It is copolymer of buna-S rubber (d) \[{{(-C{{H}_{2}}-C{{H}_{2}}-)}_{n}}\]is polythene \[\therefore \] (a) is correct answer.
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