The structure of 1,1,2,2-tetraiododisilane is shown here. (Reference: T. H. Johansen, K....

The structure of 1,1,2,2-tetraiododisilane is shown here. (Reference: T. H. Johansen, K. Hassler, G. Tekautz, K. Hagen, J. Mol. Struct ., 2001 , 598 , 171.)

a. What is the point group of this molecule?

b. Predict the number of IR-active Si–I stretching vibrations.

c. Predict the number of Raman-active Si–I stretching vibrations.