The correct order of rate of reaction towards pinacol pinacolone rearrangement is :

I>II>III

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II>I>III

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III>II>I

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I>III>II

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Solution

The correct option is B II>I>III
More stable the carbocation, more will be the rate of reaction.
II (most stable due to resonance of two phenyl groups) > I (due to resonance of one phenyl group) > III.

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