I have question regarding the solution that has been given.
In the given compound the order of case with which hydrogen atom can be abstracted from carbons I to VI is
The solution that has been given is:
In the solution they've posted above, how is the 2nd structure more stable than the third structure? The third one clearly has resonance with the pi bond, while the 2nd one has no resonance with the oxygen atom (it can't "accept" oxygen's lone pair as it is not a carbocation, and oxygen does not have an empty d orbital either)
Please can anyone shed light on this issue. Thank you!