The order of reactivity of phenyl magnesium b | vedclass

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(D) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on two main factors: $1$. Electronic factors: Alkyl groups ex

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$I > II > III$

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(D) The reactivity of carbonyl compounds towards nucleophilic addition reactions depends on two main factors: $1$. Electronic factors: Alkyl groups exhibit a $+I$-effect,which increases the electron density on the carbonyl carbon,thereby reducing its electrophilicity. Aryl groups exhibit a $+R$-effect,which also decreases the electrophilicity of the carbonyl carbon. $2$. Steric factors: As the size and number of groups attached to the carbonyl carbon increase,steric hindrance increases,which hinders the approach of the nucleophile. In the given compounds: $(I)$ is acetaldehyde $(CH_3CHO)$,which has one alkyl group and one hydrogen atom. $(II)$ is acetone $(CH_3COCH_3)$,which has two alkyl groups. $(III)$ is benzophenone $(PhCOPh)$,which has two bulky phenyl groups. Due to the combined effect of increased electron density and higher steric hindrance,the reactivity decreases in the order: $I > II > III$.

The order of reactivity of phenyl magnesium bromide $(PhMgBr)$ with the following compounds is:

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