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The geometries of some interhalogen compounds are listed below. Which pairing is incorrectly matched?

1. IF7: pentagonal bipyramid
2. BrF5: trigonal bipyramid
3. BrF3: planar T-shaped
4. ICl3: planar dimeric

Correct answer: BrF5: trigonal bipyramid

Solution

BrF5 has 5 bond pairs and 1 lone pair (sp3d2), giving a square pyramidal shape, not trigonal bipyramidal. IF7 (pentagonal bipyramid), BrF3 (T-shaped), and ICl3 (planar dimer) are correctly described.

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