?The phosphorus trihalides (PX3) show the following variation in the bond angle X ? P ?

Chapter 9, Problem 9.12

(choose chapter or problem)

The phosphorus trihalides (PX3) show the following variation in the bond angle  X P X : PF3, 96.3°; PCl3, 100.3°; PBr3, 101.0°; PI3, 102.0°. The trend is generally attributed to the change in the electronegativity of the halogen.

(a) Assuming that all electron domains are the same size, what value of the X P X angle is predicted by the VSEPR model?

(b) What is the general trend in the  X P X  angle as the halide electronegativity increases?

(c) Using the VSEPR model, explain the observed trend in  X P X  angle as the electronegativity of X changes.

(d) Based on your answer to part (c), predict the structure of PBrCl4.

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