   Chapter 21, Problem 84PS

Chapter
Section
Textbook Problem

Predict the electron pair geometry for the xenon atom in XeOF4.(a) linear(b) trigonal bipyramid(c) trigonal planar(d) octahedral(e) tetrahedral

Interpretation Introduction

Interpretation: To predict the electron pair geometry for the Xe atom in XeOF4 molecule.

Concept introduction:

The ground state outer electronic configuration of Xenon atom is 5s25p6, that is the total number of valence shell electrons in xenon atom are eight.

Electron geometry is the shape of a molecule predicted by considering both bond electron pairs and lone pair of electrons.

Molecular geometry is the shape of a molecule predicted by considering only bond pair of electrons

According to VSEPR theory, the geometry is predicted by the minimizing the repulsions between electron-pairs in the bonds and lone-pairs of electrons. The VSEPR theory is summarized in the given table as,

Electron-pairlone-pairElectron-pairgeometryMolecularshape20LinearLinear30TrigonalplanarTrigonalplanar21TrigonalplanarBent40TetrahedralTetrahedral31TetrahedralPyramidal22TetrahedralVshape50TrigonalbipyramidalTrigonalbipyramidal41TrigonalbipyramidalSeesaw32TrigonalbipyramidalTshape23TrigonalbipyramidalLinear60OctahedralOctahedral51OctahedralSquarepyramidal42OctahedralSquareplanar

Explanation

Reason for the correct option:

Depending on the number of XeF bond and Xe=O bond to be formed in XeOF4 molecule, the requisite number of electrons of the 5p orbital of the valence shell of Xe get unpaired and promoted to vaccant d-orbital of the same sub-shell. The excitation of three p-electrons into vaccant d-orbital of same sub-shell, thus making six unpaired electrons available for bond formation. Therefore, in XeOF4 molecule, there are five electron pairs and one lone pair of electrons. Hence, the electron pair geometry for the Xe atom in XeOF4 molecule is octahedral as per VSEPR theory. So, option (d) is a correct option

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