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Why does NH3 form hydrogen bond but PH3 ...

Why does `NH_3` form hydrogen bond but `PH_3` does not?

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The electronegativity of N(3.0) is much higher than that of H (2.1). As a result, N-H bond is quite polar and hence `NH_(3)` undergoes intermolecular H-bonding as shown below : In contrast, both P-H bond is not polar and hence `PH_(3)` does not undergo H-bonding.
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