Which of the following reactions cannot be us | vedclass

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(A) The reaction of Benzene with $Zn/Hg$ and conc. $HCl$ is the Clemmensen reduction,which is used to reduce carbonyl groups (aldehydes or ketones) to

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Benzene + $Zn/Hg$ and conc. $HCl$

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(A) The reaction of Benzene with $Zn/Hg$ and conc. $HCl$ is the Clemmensen reduction,which is used to reduce carbonyl groups (aldehydes or ketones) to methylene $(-CH_2-)$ groups. It does not prepare Benzaldehyde from Benzene. Option $A$ is the correct answer because this reaction is not a method for the preparation of Benzaldehyde. Option $B$ is the Etard reaction,which converts Toluene to Benzaldehyde. Option $C$ is the Rosenmund reduction,which converts Benzoyl chloride to Benzaldehyde. Option $D$ is the Gattermann-Koch reaction,which converts Benzene to Benzaldehyde.

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

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