in case of classical carbocations, their stability can be understood on the basis of common phenomenon like i effect M effect resonance etc. but for non classical carbocations these principles fail as for example
cyclopropyl methyl carbocation.
Classical carbocations ( carbenium ions) bear a positive charge on carbon and three bonds or six electrons.
In non-classical carbenium ions the positive charge does not remain on a single carbon atom but spreads over at least three atoms and those three atoms form a cyclic cation and are also known as bridged carbenium ions, beta phenyl ethyl carbocation is an example of non-classical carbocation.
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