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Any cation containing an excess positive charge on one or more carbon atoms

The tert-butyl cation is a relatively stable carbenium ion.

Any cation containing an excess positive charge on one or more carbon atoms

Structure of the 2-norbornyl non-classical carbenium ion. All other C-C bond lengths are normal (ca. 1.5 Å).

Any cation containing an excess positive charge on one or more carbon atoms

reaction of triphenylmethanol with sulfuric acid