The photo dimerization of benzophenone to benzopinacol is initiated by what type of electronic transition that then rapidly decomposes to a diradical since putting in electrons in antibonds breaks bonds! The diradical then starts abstracting hydrogens from solution as pictured in the text?σ = electrons in sigma bondsn = electrons in non-bonding orbitalsπelectrons in pi bonds.anti bondsHint: This process is very important because although the molecule responsible for human vision (retinal) is not a very long conjugated pi system, this transition allows retinal toabsorb visible light.a.n to σ*b. σ to σ*C.π το πd. n to Пe.σ to П*f. π to σ'

The question is asking about the type of electronic transition that initiates the photo dimerization…

Answered: The photo dimerization of benzophenone…

Pushing Electrons

4th Edition

ISBN:9781133951889

Author:Weeks, Daniel P.

Publisher:Weeks, Daniel P.

Chapter3: Mechanisms

Section: Chapter Questions

Problem 105EQ

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Does the minimization of electron-electron repulsions correlate with Hund's rule?
Indicate FALSE and TRUE statements. Explain briefly your each answer. ………Bond energy of N2 is larger than that of O2. ……… 24Cr and 29Cu have the electron configurations 3d44s2 and 3d94s2. ………The symmetry species for doubly and triply degenerate representations are designated as A and B. ………NCl5 is a stable molecule but PCl5 is not stable. ………The point group of GeCl4 is Oh. ………The ionization energies of the group II A metals are in the order Ba>Sr>Ca>Mg. ………The radius increases as nuclear charge increases for ions with the same electronic structure such as O2-, F-, Na+, Mg2+.
The FEMO theory of conjugated molecules is crude and marginally better results are obtained with simple Huckel theory. (a) For a linear conjugated polyene with each of N carbon atoms contributing an electron in a 2porbital, the energies Ek of the resulting π molecular orbitals are given by: Ek = α + 2β cos kπ/N+1 k = 1,2,3, ... N Use this expression to estimate the resonance integral β for the series consisting of ethene, butadiene, hexatriene, and octatetraene given that ult raviolet absorptions from the HOMO, which is a bonding π orbital, to the LUMO, which is an antibonding π* orbital, occur at 61 500, 46 080, 39 750,and 32 900 cm- 1, respectively. (b) Calculate the π-electron delocalization energy, Edelcc = Eπ -n(α + β). of octatetraene, where Eπ, is the total π-electron binding energy and n is the total number of π-electrons.
The orbital potential energies for the 4s and 4p of Br are -18.65 ev and -12.49 ev, respectively. Recall that the H 1s is -13.61 ev. The MO diagrams for HBr is not exactly the same as HF. Draw the MO diagram for HBr, including energy levels, each orbitals shape, each orbitals character (meaning what atomic orbitals contribute to each M.O. and how much), symmetry labels indicate the HOMO and LUMO, the bond order (show your work), whether the molecule is paramagnetic or diamagnetic. Compare and contrast the MO diagrams of HF and HBr.
Calculate the bond order of the C2- Is its dissociation energy greater or smaller than that of C2? Is its bond length greater or smaller than that of C2?
Calcium carbide, CaC2,contains the acetylide ion, C22-.Sketch the molecular orbital energy'level diagram for the ion and the electron dot strucure. (a) How many net σ and π bonds does the ion have? (b) What is the carbon-carbon bond order? (c) Compare the valence bond and MO pictures with regard to the number of σ and π bonds and the bond order. (d) How has the bond order changed on adding electrons to C2 to obtain C22-? (e) Is the C22- ion paramagnetic?
There is persuasive evidence for the brief existence of theunstable molecule OPCl.(a) Draw a Lewis diagram for this molecule in which theoctet rule is satisfied on all atoms and the formalcharges on all atoms are zero .(b) The compound OPCl reacts with oxygen to giveO2PCl. Draw a Lewis diagram of O2PCl for which allformal charges are equal to zero. Draw a Lewis diagram in which the octet rule is satisfied on all atoms.
The molecular ion HeH+ has an equilibrium bond length of 0.774 Å. Draw an electron correlation diagram for this molecule, indicating the occupied MOs. If the lowest energy MO has the form C11sH+C21sH , do you expect C2 to be larger or smaller than C1 ?
The molecular ion HeH+ has an equilibrium bond length of 0.774 Å. Draw an electron correlation diagram for this ion, indicating the occupied MOs. Is HeH+ paramagnetic? When HeH+ dissociates, is a lower energy state reached by forming He+H+ or He++H ?
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The wavelength at which the O2 molecule most stronglyabsorbs light is approximately 145 nm. (a) In which regionof the electromagnetic spectrum does this light fall?(b) Would a photon whose wavelength is 145 nm haveenough energy to photodissociate O2 whose bond energy is495 kJ/mol? Would it have enough energy to photoionize O2?

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