The electron domain geometry of IF4+ is __________.

Question

BlackTom AI · Accepted Answer

Question restatement: The electron domain geometry of IF4+ is __________.

Option 1: trigonal bypyramid
- Analysis: This option corresponds to a trigonal bipyramidal arrangement of electron domains (5 regions of electron density around the central atom). If there is one lone pair, the molecular geometry would be seesaw, but the electron-domain geometry remains trigonal bipyramidal. For IF4+, iodine is bonded to 4 fluorine atoms and carries a +1 charge, giving it a total of five electron-domain regions (four bonding pairs and one lone pair). Thus, the electron-domain geometry is TBP.

Option 2: tetrahedral
- Analysis: Tetrahedral geometry arises from four electron-domain regions (AX4) with no lone pairs. IF4+ has five electron domains (as explained above), not four, so tetrahedral is incorrect for the electron-domain geometry.

Option 3: octahedral
- Analysis: Octahedral geometry requires six electron-domain regions (AX6 or similar). IF4+ has only five regions, so octahedral is not appropriate here.

Option 4: seesaw
- Analysis: Seesaw is the molecular geometry arising when a trigonal bipyramidal electron-domain arrangement has one lone pair. While IF4+ indeed has a seesaw molecular shape due to one lone pair, the question asks for electron-domain geometry, not the molecular geometry. Therefore seesaw is describing the shape of the molecule, not the arrangement of electron pairs, making this choice incorrect for the specified term.

Option 5: I am unsure and need to study this concept to prepare for the exam
- Analysis: This option is not a content-based answer and does not address the chemical concept. It does not describe the geometry and can be disregarded for an academic assessment.

Summary: The correct conceptual category for IF4+ is the trigonal bipyramidal electron-domain geometry because there are five regions of electron density around iodine (four bonds to F and one lone pair). The other options either misstate the number of electron domains or confuse electron-domain geometry with molecular geometry.

CHEM 1210 AU2025 (15738) CHEM 1210 Practice Exam #4 v2 (Ch 7.1–7.4, 8, 9.1–9.6)- Requires Respondus LockDown Browser

The electron domain geometry of IF4+ is __________.

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