... the following information: boiling point (if a liquid unknown), melting point (if a solid unknown), IR spectrum, mass spectrum, PMR spectrum, decoupled CMR spectrum (optional). When analyzing the IR spectrum, remember that the absence of a band is just as informative as the presence of a band. For example, if OH band is absent, you can eliminate the possibility of an alcohol or carboxylic acid functional group. For a given functional group, more than one band is used to identify that functional group, and they all have to be present. For example, to identify an alcohol, both the OH and the C-O bands must be present. Using the mass spectrum, identify the presence or absence of Cl or Br in the compound, based on isotopic abundances of these halogens. Try to use the molecular ion peaks, not the base peak, to look for a 3:1 abundance of the M:M+2 peaks (Cl ...

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