carbocation and radicals stability

[HussainGQ]

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Can a carbocation form on an aromatic ring??Or can only carbanions form on a ring?? If a carbocation can form on aring, is it more stable than a carbocation on a tertiary carbon????? Is a carbanion on an aromatic ring the most stable form of a carbanion??Or is it do carbanions on aromatic rings follow the same rule as other carbanions (primary is most stable.........)

 

[bonez318ti]

Can a carbocation form on an aromatic ring??Or can only carbanions form on a ring?? If a carbocation can form on aring, is it more stable than a carbocation on a tertiary carbon????? Is a carbanion on an aromatic ring the most stable form of a carbanion??Or is it do carbanions on aromatic rings follow the same rule as other carbanions (primary is most stable.........)

carbocations can NOT form on a benzene ring because that would make it no longer aromatic

On a tertiary carbon, a carbocation is stabilized by the other R groups

a carbanion is stablized by any type of electron withdrawing structure (ie: aromatic ring, electronegative atoms)