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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb085

Which of the following statements about silicones are correct?

  1. AThey are water-repellent and chemically inert.
  2. BThey are made by hydrolysis of alkyl or aryl chlorosilanes followed by condensation.
  3. CHydrolysis of alone gives a cross-linked polymer.
  4. DThey have a carbon backbone of the type .

Answer: A, B

Silicones have an backbone with organic groups outside, which makes them water-repellent and inert; they are made from by hydrolysis and condensation. has one Cl and gives only the dimer . The backbone is Si and O, not carbon. Statements 1 and 2 are correct.
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