MHT CET202310 May 2023Evening ShiftChemistryPolymersActual
Which among the following statements is NOT true about high density polythene?
Options
- AIt is obtained from ethene.
- BIt needs high pressure (1000-2000 ~atm ) for synthesis.
- CPolymerization occurs in presence of Zieglar-Natta catalyst.
- DMelting point is higher than LDP.
Correct answer
B. It needs high pressure (1000-2000 ~atm ) for synthesis.
Step-by-step solution
HDP is obtained by polymerization of ethene in presence of Zieglar-Natta catalyst at a temperature of 333 ~K to 343 ~K and a pressure of 6-7 atm. Its melting point (in the range of 144 150^ C ) is higher than that of LDP (melting point 110^ C ).