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JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Polymers

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The polymer X - consists of linear molecules and is closely packed. It is prepared in the presence of triethylaluminium and titanium tetrachloride under low pressure. The polymer X is -
  1. (A)Polyacrylonitrile
  2. (B)Low density polythene
  3. (C)Polytetrafluoroethane
  4. (D)High density polythene✓ Correct

Answer: (D)

Solution

A Ziegler-Natta catalyst, triethylaluminium with titanium tetrachloride , polymerises ethene at low pressure and moderate temperature. The coordinated insertion of monomer gives essentially unbranched chains, so the macromolecules are linear and pack closely into a highly crystalline solid of high density. This linear, closely packed polymer formed under these conditions is high density polythene.

JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Single correct option

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