Madhumathy posted an Question
July 18, 2020 โ€ข 14:50 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Stability of cationic species

a cationic compound becomes stable when it is attached to a reasonable structure/an electron donating group. so on this basis I expect the answer to be IV>II>I>III But it is not so why?

2 Answer(s) Answer Now
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    Dinesh khalmaniya 1 Best Answer

    use this concept.

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    cyclopropyl methyl carbocation is more stable than benzyl carbocation and benzyl carbocation is more stable than alkyl carbocation

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    number or rings in cyclopropyl methyl carbocation is increases, stability increase

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    got it??

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    please accept the answer if you got it ๐Ÿ™๐Ÿ™

  • comment-profile-img>
    Priyanshu kumar

    tricyclopropyl cation is most stable due to dancing resonance ..... the special stability of tricyclopropyl methyl cation is a result of conjugation between the bent orbitals of the cyclopropyl ring and the vacant p orbitals of the cationic carbon..

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    https://youtu.be/8HGskL5M4cQ see this video..it surely helps

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    thank you sir

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    please mark the answer๐Ÿ˜Š๐Ÿ™

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    the video was so useful sir!! but there arises my doubt ๐Ÿ˜ฌ so is this type of dancing reasonance is possible only for cycloproyl cations or with cyclobutane and etc?

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    no for three memebered propane ring ...strain is there so orbital get bent

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    thank you sir

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    welcome...if it helps then please mark the answer ๐Ÿ˜Š

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