(a) Which of the following polymers (i) – (vi) exist in different stereochemical forms? Draw polymer structures of all the stereoregular forms that are possible for each of the polymers. (i) polyethylene (ii) poly(1-butene) (iii) poly(2-methylpropene) (polyisobutylene) (iv) poly(vinyl fluoride) (v) poly(vinylidine fluoride) (vi) poly(1,3-pentadiene) (b) Explain why high molecular weight polypropylene is optically inactive, despite having an asymmetric center at every other carbon atom, while in contrast, poly(propylene oxide) is optically active

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