Which plastic is obtained from $CHCl_3$ as follows:
$CHCl_3$ $\xrightarrow[SbF_3]{HF} X$ $\xrightarrow{800^{\circ}C} Y$ $\xrightarrow{\text{Polymerisation}} \text{Plastic}$

• A
  Bakelite
• B
  Teflon
• C
  Polythene
• D
  Perspex