There will be one other ressonance structure. It will follow the first pattern. - There will be a pi bond between the chloride and the carbon in the center. - The pi bond from the oxygen will be removed. - The oxygen will get a negative charge. - The chloride will get a positive charge.
Work Step by Step
1. Draw the lone pairs. 2. Find which pattern fits the structure. It is the first one, a lone pair (from the chloride) next to a pi bond. 3. Draw the arrows: Follow the pattern for a lone pair next to a pi bond. The electrons from the pi bond will move to the oxygen above them, so the carbon that lost the pi bond will get a positive charge. Then, the lone pairs from the chloride will form a pi bond with this positive carbon. 4. Do the changes based on the arrows. * Don't forget the formal charges!