Structures of some common polymers are given. Which one is not correctly presented ?

• A

  Teflon $\left(\mathrm{CF}_2-\mathrm{CF}_2-\right)_{\mathrm{n}}$
• Correct answer
  B

  Neoprene
  
• C

  Terylene
  
• D

  Nylon 66 $\left[\mathrm{NH}\left(\mathrm{CH}_2\right)_6 \mathrm{NHCO}\left(\mathrm{CH}_2\right)_4-\mathrm{CO}-\right]_{\mathrm{n}}$

Solution

(a) Teflon is a polymer of tetrafluoroethylene. (b) Neoprene is a polymer of chloroprene (2-chloro buta-1, 3-diene).
(c) Terylene is a polymer of terepthalic acid and ethylene glycol.

(d) Nylon-66 is a polymer of hexamethylene diamine and adipic acid. $$ \mathrm{nH}_2 \mathrm{~N}\left(\mathrm{CH}_2\right)_6 \mathrm{NH}_2+\mathrm{nHOOC}-\left(\mathrm{CH}_2\right)_4 \mathrm{COOH} $$

Hence, the correct answer is option: 'B'.