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Question

Of the following hydrides which one has the lowest boiling point?

A
AsH3
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B
SbH3
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C
PH3
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D
NH3
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Solution

The correct option is C PH3

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>PH3even though NH3 has lower molecular mass thanPH3, due to the intermolecular hydrogen bonding in Ammonia that is not present inPH3 and other hydrides in Group-15.

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