####19. Structures of some common polymers are given. Which one is not correctly presented?
[2009]
(a) Neoprene;
(b) Terylene;
(c) Nylon 6,6;
$ [-NH(CH_2)_6 NHCO(CH_2)_4 CO-] _{n} $
(d) Teflon; $(-CF_2-CF_2-) _{n}$
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