The correct order of the rate of reaction wit | vedclass

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Question

(A) The rate of nucleophilic attack by the Grignard reagent $(PhMgBr)$ depends on the magnitude of the partial positive charge $(\delta^+)$ on the car

Vedclass · Accepted Answer

$PhCOCl > PhCOMe > PhCOOMe$

Vedclass · Answer

(A) The rate of nucleophilic attack by the Grignard reagent $(PhMgBr)$ depends on the magnitude of the partial positive charge $(\delta^+)$ on the carbonyl carbon.$1.$ In $PhCOCl$,the strong $-I$ effect of the $Cl$ atom significantly increases the electrophilicity of the carbonyl carbon.$2.$ In $PhCOMe$,the $+I$ effect of the methyl group slightly decreases the electrophilicity compared to $PhCOCl$.$3.$ In $PhCOOMe$,the $+M$ effect (resonance) of the methoxy group $(-OCH_3)$ significantly reduces the electrophilicity of the carbonyl carbon.Therefore,the correct order of reactivity is $PhCOCl > PhCOMe > PhCOOMe$.

The correct order of the rate of reaction with $PhMgBr$ is:

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