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The phosphorus trihalides 1PX32 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.
(b) What is the general trend in the X¬P¬X
angle as the halide electronegativity increases?