The most stable carbocation amongst the following is:

Moderate

Solution

→ Bridge head carbocation is highly unstable
Reason, the bridge head carbocation unable to acquires the planarity [120^o] , and hence it is highly unstable.
As the no. of +IE groups [alkyl groups] increases,
sharing of positive charge by no of carbon atoms increases,
i.e., charge distribution among the atoms increases,
hence stability of carbocation increases.
Hint:
sharing increases,
caring increases,
stability increases.
E.g:

"H" is neither +IE nor –IE group Here "CH₃" group acts as +IE group
+ve cahrge located only on single carbon
$∴$ +ve charge is shared among the 4-carbon atoms

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