Question

Which of the following sets is correctly matched?

• A. C$_6$H$_5$CN -- DIBAL-H, H$_2$O -- Stephen reaction
• B. C$_6$H$_6$ -- CO, HCl, Anhy. AlCl$_3$ -- Friedel-Crafts reaction
• C. C$_6$H$_5$CH$_3$ -- (i) CrO$_2$Cl$_2$/CS$_2$ (ii) H$_3$O$^+$ -- Etard reaction
• D. C$_6$H$_5$COCl -- H$_2$/Pd -- Rosenmund reduction

Hint:

Etard reaction is specific for oxidizing methyl groups on aromatic rings to aldehydes using CrO$_2$Cl$_2$.

Answer 1

The Correct Option is C

The Etard reaction involves the oxidation of toluene derivatives (like C$_6$H$_5$CH$_3$) to benzaldehydes using chromyl chloride (CrO$_2$Cl$_2$) in carbon disulfide (CS$_2$), followed by hydrolysis. The rest of the options are incorrect either in the reagent or the reaction name.