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JEE Advanced levelSingle correct optionDifficulty 3 of 3pl148

Consider eight polymers: PVC, Bakelite, Buna-S, Terylene, polythene, melamine-formaldehyde polymer, PMMA, nylon 6,6. How many are condensation polymers, and how many of those are thermosetting?

  1. A4 condensation polymers, of which 2 are thermosetting
  2. B4 condensation polymers, of which 1 is thermosetting
  3. C3 condensation polymers, of which 2 are thermosetting
  4. D5 condensation polymers, of which 2 are thermosetting

Answer: A

Condensation polymers are bakelite, Terylene, melamine-formaldehyde polymer and nylon 6,6 (four). PVC, Buna-S, polythene and PMMA are addition polymers. Of the four, bakelite and melamine-formaldehyde are cross-linked thermosetting; Terylene and nylon 6,6 are linear and thermoplastic (two thermosetting).
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