Which of the following reactions cannot be us | vedclass

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(A) The reaction in option $(A)$ involves Clemmensen reduction conditions $(Zn-Hg/HCl)$,which are used to reduce carbonyl groups (aldehydes or ketones

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Benzoic acid $\xrightarrow{Zn-Hg 	ext{ and conc. } HCl}$

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(A) The reaction in option $(A)$ involves Clemmensen reduction conditions $(Zn-Hg/HCl)$,which are used to reduce carbonyl groups (aldehydes or ketones) to methylene groups $(-CH_2-)$. Carboxylic acids are generally inert to these conditions,so benzaldehyde cannot be prepared from benzoic acid using this method.Option $(B)$ is the Etard reaction,which produces benzaldehyde from toluene.Option $(C)$ is the Rosenmund reduction,which produces benzaldehyde from benzoyl chloride.Option $(D)$ is the Gattermann-Koch reaction,which produces benzaldehyde from benzene.

List-$I$	List-$II$
$A$. $RCN \xrightarrow[(ii) H_3O^+]{(i) SnCl_2, HCl} RCHO$	$I$. Etard reaction
$B$. $C_6H_5COCl \xrightarrow{H_2, Pd-BaSO_4} C_6H_5CHO$	$II$. Gatterman-Koch reaction
$C$. $C_6H_5CH_3 \xrightarrow[(ii) H_3O^+]{(i) CrO_2Cl_2, CS_2} C_6H_5CHO$	$III$. Rosenmund reduction
$D$. $C_6H_6 \xrightarrow[(ii) \text{anhydrous } AlCl_3/CuCl]{(i) CO, HCl} C_6H_5CHO$	$IV$. Stephen reaction

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

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