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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph164

Which of the following species have a non-zero dipole moment?

  1. A
  2. B
  3. C
  4. D

Answer: B, C

XeO3 (pyramidal) and XeOF4 (square pyramidal, with the O atom and the lone pair on the axis) have unsymmetrical shapes, so they are polar. XeF4 (square planar) and (trigonal bipyramidal with 3 O equatorial and 2 F axial) are symmetrical, so their bond dipoles cancel.
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