question_answer

Structure of some important polymers are given. Which one represents Buna-S?

A) \[-(C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,=CH-C{{H}_{2}}){{-}_{n}}\]

B) \[-(C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{{{C}_{6}}{{H}_{5}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}){{-}_{n}}\]

C) \[-(C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{CN}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}){{-}_{n}}\]

D) \[-(C{{H}_{2}}-\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,=CH-C{{H}_{2}}){{-}_{n}}\]

Correct Answer: B

Solution :

[b]