Under hydrolytic conditions, the compounds used for preparation of linear polymer and for chain termination, respectively, are
- (A)CH₃SiCl₃ and Si(CH₃)₄
- (B)(CH₃)₂SiCl₂ and (CH₃)₃SiCl✓ Correct
- (C)(CH₃)₂SiCl₂ and CH₃SiCl₃
- (D)SiCl₄ and (CH₃)₃SiCl
Answer: (B)
Solution
In silicone polymer formation:
Therefore, the correct answer is (B): (CH₃)₂SiCl₂ and (CH₃)₃SiCl.
- 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