What carbocation is most stable?

Answer 1

Check below

This answer is generalised to all compounds for stability.

1--Aromaticity -

You should check whether it satisfies the conditions for aromaticity.They are as follows:-
1-cyclic
2-all atoms must be #sp# or #sp^2# hybridised.
3-Its must follow Huckels rule.

2--Resonance
After aromaticity we check resonance.
Remember if the compound is aromatic ,the is more stable than resonating compound.(Exception might be few)
3----Hyperconjugation.

Check the number of #alpha# H.
More is the #alpha H# more the hypergujation.
Remember this will be highly needed to check carbocation.
4--Inductive effect.
5--Cross conjugation.

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Answer 2

Santiago Alfonso

The tertiary carbocation is the most stable.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.