Write the resonance structures of `(1) CH_3 COO^(Ө)` and `(2) CH_2 = CH - CHO`. Indicate the relative stability of the contributing structures.

Explanation

`{:(" "O " "O^(-) " "O^(+)),(" "|| " "| " "|),(CH_(2) = CH-C-harroverset(+)CH_(2) - CH=C-Hharroverset(-) CH_(2) - CH=C-H),(" "I " "II " "III):}`
I. Most stable, each carbon and oxygen atom has an complete octet and no carbon or oxygen atom has a charge.
II. Negative charge on more electronegative atom and positive charge on more electropositive atom.
III. Least stable as more electronegatvive oxygen has positive charge and electropositive carbon has negative charge.