Question

The reaction for the synthesis of Me₂SiCl₂ through the Rochow–Müller process is:

• A. SiCl₄ + Me₂Zn   → at 0°C
• B. Si:Fe (9:1) + 2 MeCl   → at 300°C
• C. Si:Cu (9:1) + 2 MeCl   → at 300°C
• D. SiCl₄ + 2 MeMgBr   → at 0°C

Hint:

The Rochow–Müller process involves silicon, methyl chloride, and a copper catalyst at high temperatures (around \( 300^\circ{C} \)) to produce organochlorosilanes. Look for Si + MeCl + Cu in these types of questions.

Answer 1

The Correct Option is C

The Rochow–Müller process is an industrial method used to synthesize organochlorosilanes such as dimethyldichlorosilane (Me₂SiCl₂). The key components are:

• Methyl chloride (MeCl)
• Elemental silicon
• A copper catalyst

In this process, powdered silicon reacts with methyl chloride in the presence of a copper catalyst at about 300°C, leading to the formation of methylchlorosilanes. The reaction proceeds as:

\[ \text{Si (with Cu catalyst)} + 2\,\text{MeCl} \rightarrow \text{Me}_2\text{SiCl}_2 + \text{by-products} \]

Option (C) accurately represents this industrial process with a 9:1 silicon to copper ratio.

\[ \boxed{\text{Correct process: Si:Cu (9:1) + 2 MeCl} \xrightarrow{300^\circ \text{C}} \text{Me}_2\text{SiCl}_2} \]