Discussion
Consider the following four xenon compounds: XeF2, XeF4, XeF6 and XeO3
The pair of xenon compounds expected to have non-zero dipole moment is
Answer: D
The pair with non-zero dipole moments is XeF6 and XeO3.
Use VSEPR shapes. XeF2 (three lone pairs) is linear and XeF4 (two lone pairs) is square planar; in both, the bond dipoles cancel, so the dipole moment is zero.
XeO3 has one lone pair and three bonds, giving a trigonal pyramidal shape like NH3, so its bond dipoles do not cancel. XeF6 has six bonds and one lone pair; the lone pair distorts the octahedron, so it too has a small net dipole.
Every other option includes XeF2 or XeF4, which are non-polar.
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