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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper I

Q7(c). Preparation and uses of silicones

Question

(i) How is (Me₂SiO)ₙ prepared starting from methyl chloride and silicon using copper as a catalyst? (ii) What are the applications of silicones?

Answer in brief

The direct process gives dimethyldichlorosilane, followed by hydrolysis and condensation to a polysiloxane backbone.

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As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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CoversPreparationuses of siliconesSilicon polymers

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