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Question

Which of the following is/are the incorrect statement about silicones? 
  1. They are made up of Si44 units
  2. They are polymers made up of R2SiO units
  3. They are water soluble compounds. 
  4. They are hydrophilic in nature


Solution

The correct options are
A They are made up of Si44 units
C They are water soluble compounds. 
D They are hydrophilic in nature
Synthetic organosilicon compounds having repeated R2SiO units held by SiOSi linkages. These compounds have the general formula (R2SiO)n where R = alkyl or aryl group. 
Silicones being surrounded by non-polar alkyl groups are water repelling in nature thus hydrobhobic in nature. Hence correct option is a, c, d.

THEORY
Properties:
  • Silicones being surrounded by non-polar alkyl groups are water-repelling in nature.
  • They have in general high thermal stability.
  • Good electrical insulation (High dielectric strength)
  • Chemical Inertness (resistance to oxidation and a high number of chemicals.)
Uses of Silicones:
  • They are used as sealants, greases, electrical insulators, and for waterproofing of fabrics.
  • Being biocompatible they are also used in surgical and cosmetic plants.
  • Products with the same physical properties of oils, rubbers, and resins can be produced using silicones.

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