Polypropylene can be obtained by polymerisation of

• A

  $\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{Cl}$
• B

  $\mathrm{CH}_2=\mathrm{CH}-\mathrm{Cl}$
• Correct answer
  C

  $\mathrm{CH}_3-\mathrm{Cl}$
• D

  $\mathrm{CH}_3-\mathrm{CHCl}_2$

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