For each of the following pairs of molecules, how could you differentiate between them using only their respective C=O stretches from(a)(b)S.VS.For IR stretches, the position of awill reflect how much double bond versus single bond character it has. In generalterms, a C=O peak appears at awavenumber than a simple C-O bond. Theitself, when resonancestructures are considered, reflects an appropriate average between the two forms with C-O bond and the charged structure with C-O character. In both (a) and (b), however, one molecule has an additional resonance structure with C-O character. As a result, thesemolecules should have awavenumber CO stretching frequency since they possessC-O