Which of the following reactions cannot be us | vedclass

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(B) $1$. Gatterman-Koch reaction: Benzene reacts with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ to form benzaldehyde.$2$. Etard reaction: T

Vedclass · Accepted Answer

Benzoic acid + $Zn/Hg$ and conc. $HCl$

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(B) $1$. Gatterman-Koch reaction: Benzene reacts with $CO$ and $HCl$ in the presence of anhydrous $AlCl_3$ to form benzaldehyde.$2$. Etard reaction: Toluene reacts with $CrO_2Cl_2$ in $CS_2$ followed by hydrolysis to form benzaldehyde.$3$. Rosenmund reduction: Benzoyl chloride is reduced by $H_2$ in the presence of $Pd-BaSO_4$ to form benzaldehyde.$4$. The reaction of benzoic acid with $Zn/Hg$ and conc. $HCl$ (Clemmensen reduction) is used to reduce aldehydes and ketones to alkanes,not to prepare aldehydes from carboxylic acids. Therefore,this reaction cannot be used to prepare benzaldehyde.

Which of the following reactions cannot be used to prepare benzaldehyde?

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