Queation 8 Not yet answered Marked out of 1.00000 The photochemical dimerization

Question

Queation 8 Not yet answered Marked out of 1.00000 The photochemical dimerization of trans-cinnamic acid works because:? Select one a. The HOMO of one ground state molecule is populated with an electron and reacts with the empty LUMO of another ground state molecule. Flag question O b. The LUMO of one photochemically excited molecule is populated with an electron and reacts with the empty HOMO of a ground state molecule. c. The LUMO of one photochemically excited molecule is populated with an electron and reacts with the empty LUMO of a ground state molecule. d. The HOMO of one ground state molecule is populated with an electron and reacts with the empty HOMO of another ground state molecule. O

Explanation / Answer

C. The Lumo of one photochemically excited molecule is populated with an electron and reacts with the empty LUMO of a ground state molecule.

In general, the cycloaddition reaction depends on the symmetry properties of the highest occupied molecular orbital (HOMO) of one reactant and the lowest unoccupied molecular orbital (LUMO) of the other. A bonding interaction is possible when the phases of the interacting orbitals in the HOMO and LUMO are the same. So usually by thermal activation, no reaction takes place. On photoactivation, one electron from HOMO is transferred to the LUMO of the same molecule, making it into a HOMO (singly occupied HOMO), which interact with LUMO of another molecule leads to cyclisation.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---