The phosphorus trihalides (PX3) show the following variationin the bond angle X—P—X: PF3, 96.3°; PCl3, 100.3°;PBr3, 101.0°; PI3, 102.0°. The trend is generally attributedto 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 VSEPRmodel? (b) What is the general trend in the X—P—Xangle as the halide electronegativity increases? (c) Usingthe VSEPR model, explain the observed trend in X—P—Xangle as the electronegativity of X changes. (d) Based onyour answer to part (c), predict the structure of PBrCl4.

Chemistry: Principles and Reactions
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Chapter7: Covalent Bonding
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Problem 76QAP: In each of the following molecules, a central atom is surrounded by a total of three atoms or...
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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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