To synthesize monodeuterobenzene () specifically without side products, which of the following react — Hydrocarbons Chemistry Question

💡 Solution & Explanation

Aromatic Grignard reagents ($C_6H_5MgBr$) are powerful bases. When quenched with heavy water ($D_2O$), the phenyl carbanion cleanly abstracts a deuteron ($D^+$) to yield $C_6H_5D$ and $Mg(OD)Br$.