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

Both are equally stable.
2.
Order of stability : `I gt II gt III`
(I) is most stable : More number of covalent bonds (nine), each `C` and `O` atom has an octet , no separation of opposite charges.
(II) : Negative charge on more `EN` element and positive charge on more electropositive element.
(III) does not contribute, as `O` atom has positive charge and `C` atom has negative charge, hence least stable.