JEE Main levelSingle correct optionDifficulty 2 of 3pl029
Low density polythene (LDPE) and high density polythene (HDPE) are both made from ethene. Which statement is correct?
ALDPE is made with a Ziegler-Natta catalyst and is linear, whereas HDPE is made by a free radical process and is branched
BBoth are made by free radical polymerisation, but HDPE needs a higher pressure
CLDPE is made by a free radical process at high pressure with a trace of oxygen or peroxide and is branched, whereas HDPE is made with a Ziegler-Natta catalyst at low pressure and is essentially linear
DLDPE is a condensation polymer and HDPE is an addition polymer
Answer: C
Free radical chain transfer to the polymer gives branches in LDPE (high pressure, peroxide or oxygen). The Ziegler-Natta catalyst gives linear chains that pack closely, giving HDPE.