Consider the following molecules/species: (x) tropone, (y) acetone, (z) acetate ion The correct order of carbon – oxygen double bond length is:

Step-by-step solution

In acetone (y) , the carbon-oxygen bond is a localized double bond with a bond order of approximately 2 . In the acetate ion (z) , there are two equivalent resonance structures that delocalize the negative charge equally over both oxygen atoms. This results in a carbon-oxygen bond order of exactly 1.5 . In tropone (x) , the carbon-oxygen double bond is conjugated with the system of the seven-membered ring. Polarization of the C=O bond leads to a resonance structure with a single C-O⁻ bond and a positive charge on t