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PH(3) has lower boiling point that NH(3...

`PH_(3)` has lower boiling point that `NH_(3)`. Why ?

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The electronegativity of N (3.0) is much higher than that of P (2.1). Therefore, NH undergoes extensive intermolecular H - Bonding and hence it exists as an associated molecule. To break these H-Bonds a large amount of energy is needed. On the other hand, PH, does not undergo H-bonding and thus exists as discrete molecules. Therefore the boiling point of `PH_(3)` is much lower than that of `NH_(3)`.
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