Compare the rate of reaction toward Beckmann | vedclass

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Question

(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

Vedclass · Accepted Answer

$iii > ii > i$

Vedclass · Answer

(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: $(iii) > (ii) > (i)$.

Test	Inference
$(a)$ $2, 4-DNP$ test	Coloured precipitate
$(b)$ Iodoform test	Yellow precipitate
$(c)$ Azo-dye test	No dye formation

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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