1,3,5-Hexatriene MO description for 1,3,5-Hexatriene -Three double bonds and six MOs -Only bonding orbitals,,w2,and wa,are filled in the ground state -On irradiation with ultraviolet light an electron is promoted from highest-energy filled orbital (y3)to the lowest-energy unfilled orbital (* Va and are each half-filled .This is the first (lowest energy)excited stateMO description for 1,3,5-Hexatriene •Three double bonds and six p MOs •Only bonding orbitals, ψ1 , ψ2 , and ψ3 , are filled in the ground state •On irradiation with ultraviolet light an electron is promoted from highest-energy filled orbital (ψ3 ) to the lowest-energy unfilled orbital (ψ4 *) •ψ3 and ψ4 * are each half-filled •This is the first (lowest energy) excited state 1,3,5-Hexatriene