9.1: Orbitals and Theories of Chemical Bonding

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Molecular Orbital and Valence Bond Theory

Exercise \(\PageIndex{1}\)

Which of the following statements concerning molecular orbital (MO) bond theory is/are INCORRECT?

MO theory can describe molecular bonding in excited states.
Molecular orbitals are obtained from the combination of atomic orbitals.
MO theory predicts that electrons are delocalized over the molecule through molecular orbitals.

a. 1 only b. 2 only c. 3 only d. none e. 1, 2, and 3

Answer: d. none

Exercise \(\PageIndex{2}\)

Which of the following statements concerning valence bond (VB) theory is/are INCORRECT?

VB theory can describe molecular bonding in excited states.
VB theory assumes that electrons are localized between pairs of atoms.
VB theory predicts localized lone pairs of electrons.

a. 1 only b. 2 only c. 3 only d. 2 and 3 e. 1, 2, and 3

Answer: a. 1 only

Exercise \(\PageIndex{3}\)

Which theory, valence bond or molecule orbital, correctly predicts the existence of paramagnetic molecules?

Answer: Molecular orbital theory

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