Problem: The phosphorus trihalides (PX3) show the following variation in the bond angle X-P-X: PF3, 96.3 ; , 100.3 PCl3 ; , 101.0 ; { m Pl_3}, 102.0 Pl3 . The trend is generally attributed to the change in the electronegativity of the halogen.What is the general trend in the X-P-X angle as the electronegativity increases?

FREE Expert Solution

We’re being asked to determine the general trend in the X-P-X angle as the electronegativity increases.


By the VSEPR approach, trends in many bond angles can be explained by electronegativity.


We consider the given examples:

X-P-X        angle

PF3            96.3

PCl3          101.0

PI3            102.0


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Problem Details

The phosphorus trihalides (PX3) show the following variation in the bond angle X-P-X: PF3, 96.3 ; , 100.3 PCl3 ; , 101.0 ; , 102.0 Pl3 . The trend is generally attributed to the change in the electronegativity of the halogen.

What is the general trend in the X-P-X angle as the electronegativity increases?

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