Aromatic HydrocarbonshardNUMERICAL

When 2,4,6-trinitrochlorobenzene (picryl chloride) reacts with warm water, it readily yields picric Aromatic Hydrocarbons Chemistry Question

Question

When 2,4,6-trinitrochlorobenzene (picryl chloride) reacts with warm water, it readily yields picric acid. How many strong electron-withdrawing nitro groups ($-NO_2$) are present on the ring to highly activate this normally unreactive $C-Cl$ bond towards nucleophilic attack?

Answer: 3

💡 Solution & Explanation

Unactivated aryl chlorides require extreme conditions to hydrolyze (e.g., Dow's process at $300^\circ C$). However, the presence of exactly three strongly electron-withdrawing nitro groups at the ortho and para positions in 2,4,6-trinitrochlorobenzene dramatically lowers the activation barrier via Meisenheimer complex stabilization, allowing hydrolysis to occur rapidly with just warm water.

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