Home work Physical and Theoretical Chemistry IV

- Molecular Spectroscopy -

Discussion  Fr 04.02.2005 at 10:30,  PK11-2



  Home work 11.  Molecular Symmetry. Point Groups

Exercise 1:       

a) Determine the point groups symmetry of the following molecules in their electronic ground state: H2O, acetylene C2H2, ethylene C2H4, ethane C2H6,  methylfluoride CH3F, benzene C6H6.      

Exercise 2:   

a)   Work out by yourself the multiplication table for the set of operations C2v.

b)   Explain the following statement: An object having a rotational-reflection axis Sn, where n  is odd, must necessary also have a Cn  axis coinsiding with the Sn axis and a symmetry plane σh perpendicular to the Sn axis. Is this statement correct for even values of n?