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  4. The order of relative stability of the contributing structures are

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Q. The order of relative stability of the contributing structures areChemistry Question Image

Organic Chemistry – Some Basic Principles and Techniques

Solution:

The order of relative stability of the contributing structures are
$I > II > III$
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The reason for this order is
I. The resonating structure which is most stable has more number of covalent bonds, each carbon and oxygen atom has complete octet and no separation of opposite charges.
II. negative charge on more electronegative atom and positive charge on more electropositive atom.
III. structure does not contribute as oxygen has positive charge and carbon has negative charge, hence least stable.