This book covers everything including room temperature ionic liquids, task specific ionic liquids, magnetic ionic liquids with that we included Introduction, history and classification of ionic liquids. Here we gives basic introduction of heterocyclic chemistry also, showing what it can do and how it does it, together with a clear incorporated and objective amount of the wealth of information that may be derived from the spectra. Additionally, data tables and figures provide an assessment of different methods in a standardized form, make available readers to save valuable time in the decision process to keep away from wrong turns and also help in selecting methods for doing the experiments.