Phosphorus trichloride hydrolyses more easily than Nitrogen trichloride

Phosphorus trichloride (PCl3) hydrolyses more easily than Nitrogen trichloride (NCl3)

Nitrogen is more electro negative than phosphorus. In NCl3, the electro negativity difference in between nitrogen & chlorine is very negligible. So, no polarity is created in NCl3 molecule’s N-Cl bond.

In case of PCl3, electro negativity of chlorine is more than phosphorus. So. Cl attracts electron towards itself from P-Cl bond. For that reason, polarity is found in P-Cl bond of PCl3.

Again we know that water is a polar compound. So, the poles of P-Cl bond of PCl3 molecule are attracted by the opposite poles of H-O-H bond of H2O molecule (Clδ- attracts Hδ- & Pδ- attracts Oδ-). As a result PCl3 is hydrolyzed easily.

On the other hand, NCl3 not being a polar compound is hydrolyzed slowly.

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