Both the XeCl bond dipoles and the XeF bond dipoles (red) cancel.
The trans isomer is nonpolar because there is no net dipole.
The Xe-F and Xe-Cl bond dipoles do not cancel in the cis isomer.
The molecule in the cis isomer is polar and has a net dipole moment.
There are 32 valence electrons in the trial structure.
8+14+14=36 valence electrons for 1 Xe+2 F+2 Cl.
We add two line pairs to the center atom since we have four more electrons.
The Lewis structure is
This system is an [tex]AX_{4} E_{2}[/tex]
It has an octahedral electron geometry.
The F and Cl atoms will occupy the equatorial positions, while the bulky lone pairs will occupy the top and bottom axial positions.
Square-planar molecular geometry is present.
There are two possible arrangements for the atoms.
The binding angles between F, Xe, and Cl are 180 degrees in the trans isomer.
Both the XeCl bond dipoles and the XeF bond dipoles (red) cancel.
The trans isomer is nonpolar because there is no net dipole.
The Xe-F and Xe-Cl bond dipoles do not cancel in the cis isomer.
The molecule in the cis isomer is polar and has a net dipole moment.
Learn more about Lewis's structure here:-
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