Question
Imidogen’s first excited state has a long lifetime because relaxation to its ground state has a type of this property. For 10 points each:
[10m] Name this property of reactions that are slower because reactants and products exist in different namesake states. By the Woodward-Hoffman rules, photochemical reactions of 4n (“four n”) pi electrons have a form of this property if they occur with a conrotatory mechanism.
ANSWER: spin-forbidden [or symmetry-forbidden]
[10e] Compared to spin-allowed reactions, spin-forbidden reactions possess a higher value for this quantity, the energy necessary for a reaction to occur.
ANSWER: activation energy
[10h] If the energy of two spin states are nearly identical, then the system needs to hop from one surface with this property to another for the reaction to proceed. The probability of hopping between two surfaces with this property can be calculated from Landau-Zener theory.
ANSWER: diabatic [or non-adiabatic; or not adiabatic]
<Omer, Chemistry>
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