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Solution-
As we know that carbocation at bridged carbon is not stable because they are out of plane which results in a drastic angle strain between the atoms. so, out of all , last option is most stable due to 7 alpha- hydrogen or hyperconjugation effect.
As we know that carbocation at bridged carbon is not stable because they are out of plane which results in a drastic angle strain between the atoms. so, out of all , last option is most stable due to 7 alpha- hydrogen or hyperconjugation effect.