Question

4. Determine the symmetry and the number of all normal modes of vibration for methane and chloroform and identify the modes that are IR active and modes that are Raman active. How many bands would you "see” in the IR and Raman spectra for each compound?

Answer 1

Normal modes of vibration of metnome: Methome belongs to Td (tetrashed bal) point group in which includes the following symmetry operations. E, 4631362, bod, 354 en methome , there is a l'non - degenrale ,fold degenerde and a three fold degenerate normal mode of frequencies. segmentation symmetrical on breathing Al mode totally mode of city

E two folds normal modes of city. All the vibrations are Roman on well on Iractive. chloform CcHcs) has a Car Symmetry. 6H stretch can deformation

- -> ✓ cach stretch (in phone) c-cd stretch coce stretch (asymmetric) -0-0 cl-card angle opening & closing. All the modes are IR on well on roman active.