This is a reaction of an alkyl group with cadmium, resulting in the formation of two molecules of ethyl chloride. The reaction is a dehalogenation and redistribution reaction.
\[
\text{C}_6\text{H}_5\text{C}_2\text{H}_5 + \text{Cd} \xrightarrow{} 2\text{C}_2\text{H}_5\text{COCl}
\]