"Electron delocaization is very much possible on carbonyl carbons.  We can draw the pi molecuialr orbital structure of 1,4-benzoquinone, and identify four clearly bonding orbitals which, taken together, give significant (net) pi bonding along all the linkages of the molecule.  It looks like it has aromatic character (though not ""fully"" aromatic) to me.    olthe3rd1 

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