The phosphorus tri-halides (PX3) show the following variations in the bond angle X-P-X: PF3, 100.3o, PCl3, PBr3,

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The phosphorus tri-halides (PX3) show the following variations in the bond angle X-P-X: PF3, 100.3o, PCl3, PBr3, 101.0o PI3, 102.0o. The trend is generally attributed to the change in the electro-negativity of the halogen.
(a) Assuming that all electron domains are the same size, what value of the angle is predicted by the VSEPR model?
(b) What is the general trend in the X-P-X angle as the halide electro-negativity increases?
(c) Using the VSEPR model, explain the observed trend in X-P-X angle as the electro-negativity of X changes.
(d) Based on your answer to part (c), predict the structure of PBrCl4.
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Chemistry The Central Science

ISBN: 978-0321696724

12th edition

Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward

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