Which hydride in group 15 has highest boiling point?
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Answer: NH3>PH3<AsH3<SbH3<BiH3
From PH3 to BiH3, the boiling points increase with increase in molecular weights, due to the increase in Van der Waal's forces with molecular mass.
However, boiling point of NH3>PH3 even though NH3 has lower molecular mass than PH3, due to the intermolecular hydrogen bonding in Ammonia that is not present in PH3 and other hydrides in Group-15.
From PH3 to BiH3, the boiling points increase with increase in molecular weights, due to the increase in Van der Waal's forces with molecular mass.
However, boiling point of NH3>PH3 even though NH3 has lower molecular mass than PH3, due to the intermolecular hydrogen bonding in Ammonia that is not present in PH3 and other hydrides in Group-15.
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