1. (a) The following reducible representation (T) corresponds to the molecular motions of a molecule belonging to the Da point group. Reduce I to its combination of irreducible representations. 3 C2 -1 2 C3 (b) Identify the translational modes: ldentify the rotational modes: Determine the vibrational modes: (c) Which of these vibrational modes will be IR-active? Which of these vibrational modes will be Raman-active?