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# Why does NH3 form hydrogen bond but PH3 does not?

7.4     Why does $NH_{3}$  form hydrogen bond but $PH_{3}$ does not?

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$NH_{3}$  form hydrogen bond but $PH_{3}$ does not because Nitrogen has the massive attraction of the electron to the nucleus due to its higher electronegativity in comparison to the phosphorus. hence H-bonding in PH3 is very less as compared to NH3.

Note: Conditions for the formation of H-bond are-

•  high electronegativity
•  small size

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