JEE Advanced · 2015 · 24 May 2015 · Paper 2 · p-Block Elements

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Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination, respectively, are
  1. (A)CH₃SiCl₃ and Si(CH₃)₄
  2. (B)(CH₃)₂SiCl₂ and (CH₃)₃SiCl✓ Correct
  3. (C)(CH₃)₂SiCl₂ and CH₃SiCl₃
  4. (D)SiCl₄ and (CH₃)₃SiCl

Answer: (B)

Solution

In silicone polymer formation:
  • Linear polymers are formed from difunctional monomers like (CH₃)₂SiCl₂, which has two reactive Cl groups that can form Si-O-Si linkages on both sides, creating a chain.
  • Chain termination occurs with monofunctional compounds like (CH₃)₃SiCl, which has only one reactive Cl group, capping the chain end.

Therefore, the correct answer is (B): (CH₃)₂SiCl₂ and (CH₃)₃SiCl.

JEE Advanced · 2015 · 24 May 2015 · Paper 2 · One or more correct options

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