Sketching vibrations can be quite indicative of the geometry of a molecule.
(i) Using the As - Cl bonds as a basis, write the reducible representation Tstretch to describe the As - Cl stretching vibrations. (ii) Reduce this representation to express it in terms of irreducible representations. (iii) Using your result from part (ii) above, how many bands would you expect to see in the As - Cl stretching region of the Raman spectrum? Explain your reasoning.