# The structure of $ICl_6^ -$ is:A.Pentagonal bipyramidB.Square pyramidC.Trigonal bipyramidD.Octahedral

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Hint: Start by calculating the hybridization of the given molecule and then determining the geometry. The structure of the chemical may then be easily identified. Keep in mind that the compound's shape and structure do not have to be identical.

 Z Hybridization Geometry 2 $sp$ Linear 3 $s{p^2}$ Trigonal planar 4 $s{p^3}$ Tetrahedral 5 $s{p^3}d$ Trigonal bipyramidal 6 $s{p^3}{d^2}$ Octahedral 7 $s{p^3}{d^3}$ Pentagonal bipyramidal

We know that the hybridization of this molecule is $s{p^3}{d^3}$. Hence looking at the table above we notice that its structure is pentagonal pyramidal.

Hence the correct option is option A.

Another easy way would be by understanding that Because chlorine has a large size, due to steric crowding by 6 chlorine atoms, the lone pair does not participate in hybridization or, to put it another way, it occupies an orbital with 100% s character, leaving the other orbitals $s{p^3}{d^3}$, giving the molecules a perfect octahedral form.