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The N - Cl bond is only slightly polar, with the greater electron density on the nitrogen. Hydrolysis is thought to be initiated by nucleophilic attack of a water molecule on the chlorine. Phosphorus trichloride hydrolysis proceeds by the normal later-period method of water attacking the central phosphorus atom. This is possible because phosphorus has readily available d-orbitals in the valency shell. Second period elements such as nitrogen lack these and that is why many of their compounds are resistant to hydrolysis.

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Q: Why are the modes of hydrolysis of NCl3 and PCl3 different?
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