Which of the following theories is superior to others__________________?
Correct answer: C. MOT
- A. VSEPR
- B. VBT
- C. MOT
- D. none of the above
Explanation
Molecular orbital theory is considered more comprehensive because it treats electrons as occupying molecular orbitals spread over the whole molecule and explains bond order, delocalisation and magnetic behaviour. Valence bond theory and VSEPR are useful but have more limitations for such properties. The likely mistake is choosing VSEPR because it is very useful for predicting molecular shapes, although it is not the most complete bonding theory.
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About VSEPR Theory
Valence shell electron pair repulsion theory predicts molecular shape by arranging bonding pairs and lone pairs around a central atom to minimize repulsion. Questions cover linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral electron geometries, bond angles and distortions caused by lone pairs. Electron geometry is not always the same as molecular shape.
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