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    Electronic Configuration, Formation and Enthalpy of Activation

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    CHEMILUMINESCENCE: SYNTHESIS OF LUMINOL
    1. Define the following terms.
    a. fluorescence
    b. phosphorescence
    c. chemiluminescence
    d. intersystem crossing
    2. What is the difference in electronic configuration of a singlet and a triplet state?

    ALKYNE FORMATION: DEHYDROBROMINATION OF MESO-STILBENE DIBROMIDE(Preparative)

    2. The solvent used in the preparation of diphenylacetylene (2) is triethylene glycol.
    a. Write the structure of triethylene glycol; circle and label each of the functional groups in this molecule.

    b. What structural features account for the high boiling point of this solvent?
    4. Give a stepwise mechanism showing the base-induced formation of diphenyl- acetylene from meso-stilbene dibromide. Use curved arrows to symbolize the flow of electrons.
    6. Why do you think the enthalpy of activation, delta-H ‡, for a syn-periplanar elimination is higher than that for an anti-periplanar elimination?

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    https://brainmass.com/chemistry/organic-chemistry-bonding/electronic-configuration-formation-enthalpy-activation-511266

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    CHEMILUMINESCENCE: SYNTHESIS OF LUMINOL
    1. Define the following terms.
    a. fluorescence: Fluorescence is the property of some atoms and molecules to absorb light at a particular wavelength and to subsequently emit light of longer wavelength after a brief interval, termed the fluorescence lifetime
    b. phosphorescence: The process of phosphorescence occurs in a manner similar to fluorescence, but with a much longer excited state lifetime.
    c. chemiluminescence: Chemiluminescence is the generation of electromagnetic ...

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    The expert examines electronic configuration, formation and enthalpy of activation.

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