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(B) The reactivity of carbonyl compounds towards nucleophilic addition (like Grignard reagents) depends on the magnitude of the positive charge on the

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$II > I > III$

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(B) The reactivity of carbonyl compounds towards nucleophilic addition (like Grignard reagents) depends on the magnitude of the positive charge on the carbonyl carbon.$1$. $HCHO$ $(II)$ has two hydrogen atoms attached to the carbonyl carbon,which provide no electron-donating effect,making it the most reactive.$2$. $CH_3CHO$ $(I)$ has one methyl group which provides a $+I$ (inductive) effect,reducing the positive charge on the carbonyl carbon,making it less reactive than $HCHO$.$3$. $CH_3COC_6H_5$ $(III)$ has a phenyl group attached to the carbonyl carbon,which provides a strong $+M$ (mesomeric) effect,significantly reducing the positive charge on the carbonyl carbon,making it the least reactive.Therefore,the correct order of reactivity is $II > I > III$.

What is the correct order of reactivity of the following compounds towards a Grignard reagent?
$(I)$ $CH_3CHO$
$(II)$ $HCHO$
$(III)$ $CH_3COC_6H_5$

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What is the correct order of reactivity of the following compounds towards a Grignard reagent?$(I)$ $CH_3CHO$$(II)$ $HCHO$$(III)$ $CH_3COC_6H_5$