Ethyl Chloride is converted into diethyl ether by
(d) C2H5Cl + NaOC2H5 C2H5-O-C2H5 + NaCl
It is an example of Williamson's synthesis. Limitations of williamson's Synthesis 3 alkyl halide does not gives Williamson's synthesis. If 3 alkyl halide used in reaction then alkene formed.