CH4→C2H2→C6H6→CLC6H6

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The first step is the conversion of methane (CH4) into acetylene (C2H2) through a process known as pyrolysis or steam cracking. This can be done under high temperatures and in the presence of a catalyst.

In the second step, acetylene (C2H2) can be used to synthesize benzene (C6H6) through various chemical reactions such as alkyne trimerization or dehydrogenation.

Lastly, chlorobenzene (C6H5Cl) can be obtained by substituting one of the hydrogen atoms in benzene with a chlorine atom. This reaction is typically carried out using chlorine gas in the presence of a catalyst.

Overall, the conversion from methane to chlorobenzene involves several intermediate steps and chemical reactions to transform the initial starting material into the desired final product.