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Question

Give the formula and describe the structure of a noble gas species which is isostructural with:
(i) ICl4 (ii) IBr2 (iii) BrO3

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Solution

(i) XeF4 is isostructural with ICl4. It is square planar due to sp3d2 hybridization which results in octahedral geometry with two lone pairs occupy opposite positions.
(ii) XeF2 is isostructural with IBr2. It has a linear shape due to sp3d hybridization which results in trigonal bipyramidal geometry with 3 lone pairs in equatorial plane.
(iii) XeO3 is isostructural with BrO3. It has a pyramidal shape due to sp3 hybridisation with terahedral geometry in which one position is occupied by a lone pair.

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