Potassium fluoride on alumina was proved to be an efficient dehydrohalogenating agent for the synthesis of per(poly)fluoroalkyl substituted alkenes and alkynes. The reaction was simple, mild and the yields ranged from good to excellent. Potassium fluoride on alumina was proved to be an efficient dehydrohalogenating agent for the synthesis of per (poly) fluoroalkyl substituted alkenes and alkynes. The reaction was simple, mild and the yield ranged from good to excellent.