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Atomic Size and Electronegativity

PH3 has lower...

Question

$P H_{3}$ has lower boiling point than $N H_{3}$ . Why?

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Solution

Hydrogen bonding is obtained when H atom is attached to electronegative N,O or F atom.

$P H_{3}$ has lower boiling point than $N H_{3}$ . In $N H_{3}$ , intermolecular hydrogen bonding leads to molecular association. Huge amount of energy is required to break these hydrogen bonds. Hence, $N H_{3}$ has high boiling point. In $P H_{3}$ , no hydrogen bonding is possible.

Therefore, $P H_{3}$ has lower boiling point.

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