The phosphorus trihalides 1PX32 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.

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Quantum Mechanical Treatment of the Valence Bond Theory

Quantum mechanical treatment of valence bond theory refers to the relationship established between the quantum mechanical theory and the valence bond theory to describe the chemical bonding in a particular molecule.