Question

Why non classical carbocation is greater than classical carbocatiion?

Answer 1

Non-classical ions. ... As circumstantial evidence of their unusual bonding, the 2-norbornyl cation is also more stable than a typical "secondary" carbocation, being roughly as stable as t-butyl cation, according to hydride ion affinity. The existence of non-classical carbocations was once the subject of great controversy

Answer 2

The structure of molecules or molecular ions that escapes description in terms of conventional rules of valency and stereochemistry. ... Which is more stable, carbocation tert butyl carbocation, or allylic carbocation?