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The correct match between item I and Item II is:
          Item I                                                 Item II
          a. Natural rubber                                I. 1, 3 – butadiene + syrene
          b. Neoprene                                       II. 1, 3-butadiene +acrylonitrile
          c. Buna – N                                        III. Chloroprene
          d. Buna – S                                        IV. Isoprene

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$a - III, b - IV, c - II, d - I$

$a - IV, b - III, c - I, d - II$

$a - III, b - IV, c - I, d - II$

$a - IV, b - III, c - II, d - I$

answer is A.

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Detailed Solution

The monomer of natural rubber is isoprene

In Buna-S one of the monomer is acrylonitrile

In Buna N one of the monomer is styrene

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The correct match between item I and Item II is: Item I Item II a. Natural rubber I. 1, 3 – butadiene + syrene b. Neoprene II. 1, 3-butadiene +acrylonitrile c. Buna – N III. Chloroprene d. Buna – S IV. Isoprene