alleryIn the **Etard reaction**, toluene is oxidised to benzaldehyde by
A$O_3$
B$CrO_2Cl_2$ in $CS_2$
C$K_2Cr_2O_7/H_2SO_4$
D$KMnO_4$
Answer & Solution
Correct answer: B. $CrO_2Cl_2$ in $CS_2$
$C_6H_5CH_3 \xrightarrow{CrO_2Cl_2/CS_2} \text{chromyl complex} \xrightarrow{H_2O} C_6H_5CHO$.
Chromyl chloride stops at the aldehyde because the intermediate Etard complex protects the $-CHO$ from over-oxidation until workup.
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