What is R.D.S.of pinacol-pinacolone rearrangement?

I step

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II step

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III step

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IV step

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Solution

The correct option is B II step
i) Formation of carbocation in second step is slow, rate determining step.
ii) Carbocation formation requires bond breaking for which input of energy is required. This makes it a slow step.
iii) Hence, Step II is $R . D . S$ of pinacol - pinacolone rearrangement.

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