The introduction of fluoride by nucleophilic aromatic substitution is found to be more effective when ionic liquids, e.g., 1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-3-methylimidazolium hexafluorophosphate are used as a solvent.The use of the ionic liquids increased the yield and lowered the reaction temperature of similar fluorination reactions vis-a-vis organic solvents.In the absence of any suitable solvent for fluorination reactions, the ionic liquids appear to be most suitable option especially for large scale.A new and highly efficient, neat reaction protocol for the synthesis of fluorinated organic compounds such as (4-fluoronitrobenzene, 2-fluoronitrobenzene, 2-fluorobenzonitrile, 2,4-difluoronitrobenzene) using halex reaction in ionic liquids were developed.The operational simplicity, low temperature, high yield, eco-friendly, safe, easily scalable processes with recyclability of ionic liquids are major benefits.