The aldehydes which will not form a single Gr | vedclass

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(A) Grignard reagents are strong bases as well as nucleophiles. They react with acidic protons (like those in $-COOH$ or $-OH$ groups) before reacting

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$ (b), (d) $

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(A) Grignard reagents are strong bases as well as nucleophiles. They react with acidic protons (like those in $-COOH$ or $-OH$ groups) before reacting with the carbonyl group.$(a)$ Benzaldehyde has no acidic protons,so $1$ equivalent of Grignard reagent reacts with the aldehyde group.$(b)$ $4$-Formylbenzoic acid contains an acidic $-COOH$ group. It consumes $1$ equivalent of Grignard reagent for acid-base reaction and another for the aldehyde,totaling $2$ equivalents.$(c)$ $4$-Methoxybenzaldehyde has no acidic protons,so $1$ equivalent reacts with the aldehyde group.$(d)$ $4$-(Hydroxymethyl)benzaldehyde contains an acidic $-OH$ group. It consumes $1$ equivalent for acid-base reaction and another for the aldehyde,totaling $2$ equivalents.Thus,compounds $(b)$ and $(d)$ will not form a single Grignard product with only $1$ equivalent of reagent.

The aldehydes which will not form a single Grignard product with one equivalent of Grignard reagent are:
$(a)$ Benzaldehyde
$(b)$ $4$-Formylbenzoic acid
$(c)$ $4$-Methoxybenzaldehyde
$(d)$ $4$-(Hydroxymethyl)benzaldehyde

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The aldehydes which will not form a single Grignard product with one equivalent of Grignard reagent are:$(a)$ Benzaldehyde$(b)$ $4$-Formylbenzoic acid$(c)$ $4$-Methoxybenzaldehyde$(d)$ $4$-(Hydroxymethyl)benzaldehyde