$C _{2} H _{5} Cl$ can give Grignard reagent when reacted with $Mg$ in dry ether.
$R X+M g(d r y) \xrightarrow{\text { Dry ether }} R M g X$
$C_{2} H _{5} Cl + Mg \xrightarrow{\text { Dry ether }}\underset{\text{ethyl magnesium chloride}}{C _{2} H _{5} MgCl}$