Boiling point of phosphine is less than that of ammonia though its molecule size is more. Assign reason.

Boiling point of phosphine is less than that of ammonia though its mol

1.	Boiling point of phosphine is less than that of ammonia though its molecule size is more. Assign reason.
Answer» In ammonia `(NH_(3))`, the molecules are involved in the intermolecular hydrogen bonding on account of the polarity of N-H bonds. But the same is not possible in molecules of phosphine `(PH_(3))` since the polarity of P-H bond is negligible as compared to N-H bond. This is due to lesser electronegativity of phosphorus (2.1) as compared to nitrogen (3.1). Therefore, boiling point of ammonia is more than that of phosphine.

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Boiling point of phosphine is less than that of ammonia though its molecule size is more. Assign reason.

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