Which of the following polymers could not exist as isotactic and syndiotactic stereoisomers?
Enter letters (A - G), corresponding to your selection. Do not enter superfluous characters, since they will be counted as incorrect answers.
A Polypropylene
B Poly(methyl methacrylate)
C Poly(vinylidene chloride)
D Polyacrylonitrile
E Poly(vinyl acetate)
F Teflon
G Polystyrene