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Explain why propone polymerises in isota...

Explain why propone polymerises in isotactic,syndiotactic and atactic forms ,while vinylidence chloride`(CH_(2)=CCl_(2))`does not.
(b) Which form of polypropene (isotatic,syndiotactic,and atactic)Would be optically active?

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(a)Polypropene has chiral`C`atoms and,therefore,exists in different forms as mentioned .Polyethylidene chloride,on the other hand ,does not have chiral`C` atom and thus does not exist in the forms mentioned.
(b)All formsof polypropence`(PP)`would exist in equal amount of enantiomers,with net specific rotaiton of zero,So each form would exist as racemates.
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