IR and Raman spectra are very useful for determining the structure of metal carbonyls. The irreducible representations for the CO stretches (I co) are listed for some metal carbonyls below. Use this information (and the appropriate character tables) to explain how IR and Raman spectroscopy might be able to differentiate these compounds (or not). Compound Structure cis-M(CO)4L2 C trans-M(CO)4L2 CIIII.. fac-M(CO)3L3 mer-M(CO)3L3 LI ICO A1+A1B1 + B2 Alg+Big+ Eu A1+ E M... A1 + A1+ B1