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PH_(3) has lower boiling point than NH_(3). Why ? |
Answer» Solution :The electronegativity of N(3.0) is much higher than that of P(2.1). Therefore, `NH_(3)` undergoes extensive intermolecular H-bonding and hence it exsists as an ASSOCIATED molecule. To BREAK these H-bonds, a LARGE amount of energy is NEEDED. On the other hand, `PH_(3)` 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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