Answer
There will be only one other ressonance structure.
It will follow the second pattern.
- There will be a pi bond between the oxygen and the positive carbon.
- The carbon will lost its positive charge.
- The oxygen will get a positive charge.
Work Step by Step
1. Draw the lone pairs.
2. Find which pattern does that structure fits.
It is the second one, a lone pair (from the oxygen) next to a positive charge.
3. Draw the arrows:
Follow the pattern for a lone pair next to a positive charge.
One lone pair from the oxygen will move to form a pi bond between it and the positive carbon.
4. Do the changes based on the arrows.
* Don't forget the formal charges!
