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

[I: Most stable, more number of covalent bonds, each carbon and oxygen atom has an octet and no separation of opposite charge II: negative charge on more electronegative atom and positive charge on more electropositive atom, III: does not contribute as oxygen has positive charge and carbon has negative charge, hence least stable].