Which of the following is an incorrect method | vedclass

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(D) Let us analyze each reaction pathway for the synthesis of benzaldehyde:$A$. Etard reaction: Toluene is oxidized by $CrO_2Cl_2$ in $CS_2$ followed

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$D$. Reaction of benzonitrile with $CH_3MgBr$ followed by hydrolysis

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(D) Let us analyze each reaction pathway for the synthesis of benzaldehyde:$A$. Etard reaction: Toluene is oxidized by $CrO_2Cl_2$ in $CS_2$ followed by hydrolysis to give benzaldehyde. This is a correct method.$B$. Rosenmund reduction: Benzoyl chloride is reduced by $H_2$ in the presence of $Pd-BaSO_4$ (Lindlar catalyst) to give benzaldehyde. This is a correct method.$C$. Toluene is oxidized by $CrO_3$ in the presence of acetic anhydride to form a gem-diacetate intermediate,which upon hydrolysis yields benzaldehyde. This is a correct method.$D$. Reaction of benzonitrile $(C_6H_5CN)$ with $CH_3MgBr$ (a Grignard reagent) followed by hydrolysis yields acetophenone $(C_6H_5COCH_3)$,not benzaldehyde. Therefore,this is an incorrect method for the synthesis of benzaldehyde.

Which of the following is an incorrect method for the synthesis of benzaldehyde?

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