Evaluate the upper state symmetry for each of the following combination bands in benzene: 16 +

Evaluate the upper state symmetry for each of the following combination bands in benzene: ν₁₆ + ν₂, ν₁₀ + ν₁₃, ν₂ + ν₁₆ + ν₁₈, and 2ν₂ + ν₁₈. In each case, what operator could result in Raman or IR activity of the transition? Assume that the initial state is the ground vibrational state. Note that the ν₁₀ mode has B_2u symmetry.