Explanation

(c)
In the formation of $XeF_{6}$ molecule, three 5 p electrons are promoted to 5d orbitals. Now, one 5s, three 5p and three 5d-orbitals of Xe atom intermix together and form seven $sp^{3}d^{3}$ hybrid orbitals. One $sp^{3}d^{3}$ hybrid orbital contains one lone pair of electrons while other six are half-filled. The expected geometry is pentagonal bipyramidal.
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