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AP EAMCET202119 Aug 2021Morning ShiftChemistryHaloalkanes and HaloarenesActual

Identify ( P ) and ( Q ) in the following reaction: 2 CH 3 Cl + Si   → 570   K Cu   powder P ⟶ H 2 O Q ⟶ Straight   chain   polymer

Options

  1. AP :   CH 3 3 SiCl Q :   CH 3 3 SiOH
  2. BP :   CH 3 2 SiCl 2 Q :   CH 3 2 Si ( OH ) 2
  3. CP :   CH 3 2 SiCl 2 Q :   CH 3 2 Si ( OH ) Cl
  4. DP :   CH 3 2 SiCl 2 Q :   CH 3 2 SiO

Correct answer

B. P :   CH 3 2 SiCl 2 Q :   CH 3 2 Si ( OH ) 2

Step-by-step solution

When methyl chloride reacts with silicon in the presence of copper as a catalyst at a temperature 573   K various types of methyl substituted chlorosilane of formula MeSiCl 3 ,   Me 2 SiCl 2 ,   Me 3 SiCl with small amount of Me 4 Si are formed. Hydrolysis of dimethyl dichlorosilane, CH 3 2 SiCl 2 followed by condensation polymerisation yields straight chain polymers. 2 CH 3 Cl + Si   → 570   K Cu   powder CH 3 2 SiCl 2 → - 2 HCl + 2 H 2 O CH 3 2 Si OH 2

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