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JEE Main levelSingle correct optionDifficulty 2 of 3pl138

Which sample would be expected to have a polydispersity index very close to 1?

  1. APVC made by free radical polymerisation
  2. BA purified globular protein such as haemoglobin
  3. CLDPE made by free radical polymerisation
  4. DNylon 6,6 made by melt polycondensation

Answer: B

Natural proteins have a defined sequence and a single molar mass (monodisperse, PDI = 1). Synthetic polymers from random chain growth or step growth are polydisperse, PDI > 1.
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