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Priyanshu kumar Best Answer
More is the resonance,more is delocalisation of positive charge,more is the stability of carbocation. 4th:- Benzyl carbocation is most stable as it has 4 resonance contributors. 5th:- triphenyl methyl cation is most stable (10 resonating structure) followed by diphenyl methyl carbocation (7 resonating structures) and lastly benzyl carbocation (4 resonating structures)