$MeOCH _{2} Cl$ $\xrightarrow{Slow}$$\underset{(i)}{\mathop{Me\underset{\,\,\centerdot \,\,\centerdot }{\overset{\centerdot \,\,\centerdot }{\mathop{O}}}\,\overset{+}{\mathop{C{{H}_{2}}}}\,+C{{l}^{-}}}}\,$  $\leftrightarrow $  $\underset{(ii)}{\mathop{Me-\underset{\,\,\centerdot \,\,\centerdot }{\overset{+}{\mathop{O}}}\,=C{{H}_{2}}}}\,$

Though $(ii)$ contains positive charge on oxygen, octet around each atom in $(ii)$ is complete, structure $(ii)$ is more stable than $(i)$.