Which of the following are example of synthetic rubber? (i) Polychl...

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Which of the following are example of synthetic rubber?
(i) Polychloroprene
(ii) polyacrylonitrile
(iii) Buna-N
(iv) cis-polyisoprene
(a) (i) and (iii)
(b) (i) and (ii)
(c) (iii) and (iv)
(d) (ii) and (iii)
\( \mathrm{P} \)
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