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

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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.

Item-$I$	Item-$II$
$I$. Benzene	$P$. $HCl$ and $SnCl_2, H_3O^{+}$
$II$. Benzonitrile	$Q$. $H_2, Pd-BaSO_4, S$ and quinoline
$III$. Benzoyl Chloride	$R$. $CO, HCl$ and $AlCl_3$

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

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The correct match between Item-$I$ (starting material) and Item-$II$ (reagent) for the preparation of benzaldehyde is :
Item-$I$ Item-$II$
$I$. Benzene $P$. $HCl$ and $SnCl_2, H_3O^{+}$
$II$. Benzonitrile $Q$. $H_2, Pd-BaSO_4, S$ and quinoline
$III$. Benzoyl Chloride $R$. $CO, HCl$ and $AlCl_3$

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