9.1: Orbitals and Theories of Chemical Bonding

Chem 1402:General Chemistry I · LibreTexts

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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?

    1. MO theory can describe molecular bonding in excited states.
    2. Molecular orbitals are obtained from the combination of atomic orbitals.
    3. 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?

    1. VB theory can describe molecular bonding in excited states.
    2. VB theory assumes that electrons are localized between pairs of atoms.
    3. 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

    9.1: Orbitals and Theories of Chemical Bonding is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.