Ethyl chloride cannot be directly converted into tetraethyl lead. Tetraethyl lead is primarily obtained through the reaction of ethylene dichloride (EDC) with a sodium-lead alloy. Here's the simplified overall reaction:

4 C2H4Cl2 (ethylene dichloride) + 4 Na-Pb alloy → Pb(C2H5)4 (tetraethyl lead) + 4 NaCl (sodium chloride) + PbCl2 (lead chloride)

In this process, the sodium-lead alloy serves as a source of both sodium and lead. The reaction takes place at elevated temperatures and produces tetraethyl lead, sodium chloride, and lead chloride as the main products. The tetraethyl lead can then be separated and purified through various techniques such as distillation and crystallization.