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JEE Main levelSingle correct optionDifficulty 2 of 3pl126

Which pair correctly describes how low-density (LDPE) and high-density polyethene (HDPE) are made?

  1. ALDPE: anionic polymerisation with butyllithium; HDPE: cationic polymerisation with a Lewis acid
  2. BLDPE: free radical polymerisation at high pressure with a peroxide or traces of oxygen; HDPE: Ziegler-Natta catalyst at low pressure
  3. CBoth: Ziegler-Natta catalyst at high pressure
  4. DLDPE: Ziegler-Natta catalyst at low pressure; HDPE: free radical polymerisation at high pressure with a peroxide

Answer: B

High-pressure free radical polymerisation gives branched chains (LDPE). The Ziegler-Natta catalyst, with , gives linear chains (HDPE) at low pressure.
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