C-11-Q054mediumsingle_mcqnCH2=CH2→1000 atm, 200 ∘C?\mathrm{nCH_2=CH_2 \xrightarrow{1000\ atm,\ 200\,^{\circ}\text{C}} ?}nCH2=CH21000 atm, 200∘C?aপলিথিনbপলিপ্রোপিনcPVCdনাইলন