These are some of the most stable carbocations, but what is the relative stability order between them.
According to me it should be: C>D>B>A........ I came to this conclusion because both C and D have equal number of resonating structures i.e.7.However Bend orbital Bond seems to stabalise more than Resonance so C is assigned higher priority.
However, my teacher says that the order should be C>B>A>D........ and he gives priority to Bend orbital bond above anything else.
However, I seem to disagree with his answer. Unfortunately, I don't have the source of the question to verify the answer and couldn't find anything relatable on the internet.
So any help would be appreciated.
(Also, as a side question, which is the most stable carbocation ever isolated, is it tricyclopropylmethylcarbocation or tropyllium ion or any other. If anyone knows the answer might help)
(Found several other questions like mine on cyclopropyl metgy carbocation. However the answers either are using Molecular Orbital Theory Or some other concepts which I haven't learnt(I am still in school). So I wish for a more simplistic approach to the question. Also they are not able to explain the exact position of tropylium ion in the order)