I know about the exceptional stability of Cyclopropylmethyl carbocation.

In some books it is given that cyclopropyl and cyclobutyl carbocations are highly unstable due to their high strain. That is true and quite acceptable, but just like cyclopropylmethyl carbocation they can also have resonance structures and the cyclobutyl carbocation can rearrange itself to the cyclopropylmethyl carbocation by ring contraction. My question is, what will the stability order between the cyclopropyl, cyclobutyl, cyclopentyl carbocations?

Also if anyone please can help me to understand why resonance structures in cyclopropyl carbocation will not be possible?

  • 2
    $\begingroup$ I have tried to fix up your question as good as I could. Please try to use proper spelling and interpunctuation, otherwise it is really hard to understand what you are trying to ask. Also not that the homework tag should no longer be used. Please note that 'resonating structures' is a wrong term. It is resonance structures, as these are structures that take part in resonance. Additionally, please check what you mean with 'cyclopropanium carbocation'; to my knowledge no such thing exists. It appears that this is a completely new question, please ask it separately. $\endgroup$ – Martin - マーチン Sep 29 '19 at 12:45
  • $\begingroup$ @Martin-マーチン I don't know why I am not able to upload the image. It is repeatedly showing error. $\endgroup$ – Sreetama ghosh hazra Sep 29 '19 at 14:50

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