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(a)The CI-O bond distance in CIO(4)^(Θ) ...

(a)The `CI-O` bond distance in `CIO_(4)^(Θ)` is 144pm What do you conclude about the structure of this ion ?
(b) The `POCI_(3)` molecule has the shape of an irregular tetrahedron with the `P` atom located centrally The `CI-P-CI` angle is found to be `1035^(@)` Give a qualitative explanation for the deviation of this structure from a regular tetrahedron .

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There must be considerable double bond character in the bonds
(b) The Lewis structure for `POCI_(3)` would show some double bond character between `P` and `O` (`P` is allowed to exceed the octet because of the availabbility of 3d orbitals)
The increased `e^(-)` density in the `P=O` bond would make the intrinsic repulsion between the `P=O` bond and a `P-CI` bond greater than between two `(P-CI)` bonds Thus the `CI-P-CI` angle is lowered and the `CI-P=O` angle is raised as compared to regular tetrahedron
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