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NEET CHEMISTRYP Block ElementsMedium

Question

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

A

Me2_2SiCl2_2

B

Me3_3SiCl

C

PhSiCl3_3

D

MeSiCl3_3

Step-by-Step Solution

High molecular mass silicone polymers are formed through the hydrolysis of organochlorosilanes followed by condensation polymerization.

  1. Me2_2SiCl2_2: Hydrolysis yields Me2_2Si(OH)2_2 (two active sites), which polymerises to form linear long-chain silicones.
  2. MeSiCl3_3 and PhSiCl3_3: Hydrolysis yields silanols with three active -OH groups, leading to cross-linked, 3D network polymers.
  3. Me3_3SiCl: Hydrolysis yields trimethylsilanol, Me3_3SiOH, which has only one active -OH group. It can condense with another silanol group to form a dimer (Me3_3Si-O-SiMe3_3), but it cannot propagate a chain. Therefore, it acts as a chain terminator rather than a monomer for high molecular mass polymers.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from P Block Elements. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYP Block Elementsfollowingmonomermolecularsiliconepolymer

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