Chapter 2, Problem 6EQ

Pairs of unshared electrons can be pushed. One Lewis structure for the methoxy-methyl cation is $C{H}_3-\ddot{\underset{¨}{O}}-C{H}_2^{+}$. The structure contains a pair of pushable electrons, namely, the unshared electrons on the $\_\_\_\_$ atom. The structure also contains a positively charged $\_\_\_\_$ atom that can act as a $\_\_\_\_$. A second resonance structure can be generated by pushing the unshared electrons to the receptor. Thus,

It is not possible to push electrons toward the other carbon, because it is not a receptor. If you tried to push electrons to this carbon, you would generate a pentavalent carbon, which is not possible.