When alkyl halide is heated with dry ${\mathrm{Ag}}_2\mathrm{O}$, it produces 

Alkyl halide on reaction with dry silver oxide, forms ether. 

$2{\mathrm{CH}}_3\mathrm{Cl}+{\mathrm{Ag}}_2\mathrm{O} \stackrel{∆}{\to }\underset{\text{ (methoxy methane) }}{{\mathrm{CH}}_3{\mathrm{OCH}}_3}+ 2\mathrm{AgCl}$