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Which of the following would have a permanent dipole moment ?A)BF3B)SiF4C)SF4D)XeF4 Pls answer it as soon as possible and also explain the reason.



SF4 is the answer. Since S has 6 valance electrons, two of them get bonded (4 electrons) while other 2 electrons remains as lone pair. According to VSEPR theory, It gains see saw-shape centered S. 
The shape is as shown in the figure.
Due to the presence of lone pairs and F ligands, It would have permanent dipole moment.

2 5 2
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