Stability order of these benzyl carbocations is:

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I > II > III

III > II > I

II > III > I

III > I > II

answer is A.

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Detailed Solution

Among the given options, all carbocations are resonance stabilized. Therefore, the comparison done on the basis of hyperconjugation. In carbocation (I), there are three alpha-hydrogens, hence it is the most stable. In carbocation (II), there are two alpha-hydrogens, hence it is more stable than carbocation (III); that has one alpha hydrogen atom.

I > II > III

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