Which of the following reactions cannot be us | vedclass

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Question

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

Vedclass · Accepted Answer

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.

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

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