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Question

Which of the following is/are polar?
  1. XeOF4
  2. ICl4
  3. XeF4
  4. SO3


Solution

The correct option is A XeOF4
The net dipole moment is zero, if three identical dipole vectors are oriented at 120 to each other.

The net dipole moment is zero, if four identical dipole vectors are oriented at 90 or 120 to each other.


XeF4 is non-polar. It has 4 bond pairs and 2 lone pairs, hence it has a square planar shape. The four dipole moments of the Xe - F bonds cancel out, resulting in zero dipole moment.

SO3 is non polar. It has trigonal planar shape. The dipoles oriented along the 3 S=O bond cancel but each other, resulting in zero dipole moment. 

XeOF4 is polar. It has squre pyramidal shape. The O atom is not attached to a F atom, but to the central Xe atom. There is also a lone pair which is attached to Xe the opposite side of O atom. Since there is not an odd number of atoms, attached to the central Xe, the dipoles do not cancel out and molecule is polar. 

ICl4 is non- polar because it has square planar geometry. All dipole from Cl cancel each other. 

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