$\mathrm{n}\left(\mathrm{CF}_{2}=\mathrm{CF}_{2}\right) \frac{\text { Benzoyl peroxide or }}{\left(\mathrm{NH}_{4}\right)_{2} \mathrm{~S}_{2} \mathrm{O}_{8}} \mathrm{X}$ Here, $\mathrm{X}$ is:

• A

  RMMA
• B

  $\mathrm{PVC}$
• C

  $\mathrm{PAN}$
• Correct answer
  D

  None of these

Solution

Here $X$ is polytetrafluoroethylene. So, none of these i.e., option (d) is correct choice.

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