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Question:

Which of these is not a monomer for a high molecular mass silicone polymer?

MeSiCl3

Me2SiCl2

Me3SiCl

PhSiCl3

Solution:

MeSiCl3, Me2SiCl2 and PhSiCl3 are monomers for a high molecular mass silicone polymer. However, Me3SiCl is not a monomer for a high molecular mass silicone polymer as it contains only one Cl atom and at best, it can form a dimer. Hence, the correct answer is option C.