Toluene is treated with chromyl chloride CrO2Cl2 in CS2 and the chromium complex formed is then hydrolysed. This is the Etard reaction and the product is

NEET levelSingle correct optionDifficulty 1 of 3co022

Toluene is treated with chromyl chloride $CrO X_{2} Cl X_{2}$ in $CS X_{2}$ and the chromium complex formed is then hydrolysed. This is the Etard reaction and the product is

The Etard complex protects the methyl-derived group from over-oxidation. Hydrolysis of the complex releases

C X_{6} H X_{5} CHO