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(C) The rate of Beckmann rearrangement depends on the leaving group ability of the group attached to the nitrogen atom.The rate-determining step $(RDS

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$iii > ii > i$

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(C) The rate of Beckmann rearrangement depends on the leaving group ability of the group attached to the nitrogen atom.The rate-determining step $(RDS)$ involves the departure of the leaving group.Better leaving groups are weaker bases.The basicity order of the conjugate bases is: $CH_3COO^- > ClCH_2COO^- > PhSO_3^-$.Therefore,the leaving group ability order is: $PhSO_3^- > ClCH_2COO^- > CH_3COO^-$.Thus,the rate of reaction follows the order: $(iii) > (ii) > (i)$.

Compare the rate of reaction toward Beckmann rearrangement for the given oxime derivatives where $\gamma$ is: $(i) CH_3COO^-$,$(ii) ClCH_2COO^-$,$(iii) PhSO_3^-$.

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