When 2,4,6-trinitrochlorobenzene (picryl chloride) reacts with warm water, it readily yields picric acid. How many strong electron-withdrawing nitro groups () are present on the ring to highly activat

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?

Prashant Kotian · Accepted Answer

Correct answer: 3. Unactivated aryl chlorides require extreme conditions to hydrolyze (e.g., Dow's process at ). 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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