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(C) The reaction sequence is as follows:$1$. Sodium benzoate reacts with $NaOH + CaO$ (sodalime) to form benzene $(A)$.$2$. Benzene $(A)$ undergoes Fr

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Etard reaction

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(C) The reaction sequence is as follows:$1$. Sodium benzoate reacts with $NaOH + CaO$ (sodalime) to form benzene $(A)$.$2$. Benzene $(A)$ undergoes Friedel-Crafts alkylation with $CH_3Cl$ in the presence of anhydrous $AlCl_3$ to form toluene $(B)$.$3$. Toluene $(B)$ reacts with chromyl chloride $(CrO_2Cl_2)$ in $CS_2$ followed by hydrolysis $(H_3O^+)$ to form benzaldehyde $(C)$.This specific oxidation of the methyl group of toluene to a formyl group using chromyl chloride is known as the $Etard$ reaction.

In the given reaction sequence,the conversion of $B$ to $C$ is known as:

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