Question
What happens when silicon is heated with methyl chloride in presence of copper as a catalyst at $$573\,K?$$
A.
Methyl substituted chlorosilanes are formed.
B.
Only $$M{e_4}Si$$ is formed.
C.
Polymerised chains of $${\left( {C{H_3}} \right)_3}SiCl$$ are formed.
D.
Silicones are formed.
Answer :
Methyl substituted chlorosilanes are formed.
Solution :
Methyl substituted chlorosilanes are formed hydrolysis of dimethyl dichlorosilane give $$M{e_2}Si{\left( {OH} \right)_2}$$ which polymerise to give silicones.
\[2C{{H}_{3}}Cl+Si\xrightarrow[570\,K]{Cu\,\text{powder}}\] \[{{\left( C{{H}_{3}} \right)}_{2}}SiC{{l}_{2}}+C{{H}_{3}}SiC{{l}_{3}}+\] \[{{\left( C{{H}_{3}} \right)}_{3}}SiCl+{{\left( C{{H}_{3}} \right)}_{4}}Si\]