Draw the possible resonance structures for $CH_3 - \ddot{O} - CH_2^+$ and predict which of the structures is more stable. Give reason for your answer.

(B) The resonance structures for the given carbocation are as follows:
$CH_3 - \ddot{O} - CH_2^+ \leftrightarrow CH_3 - O^+ = CH_2$
$(A) \leftrightarrow (B)$
Structure $(B)$ is more stable than structure $(A)$ due to the following reasons:

$A$. Less stable	$B$. More stable
The positive charge is on the carbon atom.	The positive charge is on the oxygen atom.
The octet of the positively charged carbon atom is incomplete.	The octets of all atoms (carbon and oxygen) are complete.

In structure $(B)$,every atom has a complete octet,which makes it more stable than structure $(A)$ where the carbon atom has an incomplete octet.