take propargyl alcohol and sodium hydride in 1:1.2 mole ratio in dry THF solventat at zero degrees Celsius. stir the reaction mixture for 1 hour. Add alkyl bromide dropwise to the mixture for half-an-hour through syringe at room temp. stir the reaction mixture for 24 hrs. add dist. water (equal amount to THF) to quench the reaction.Add diethyl ether to the reaction mixture. collect upper layer of diethyl ether and evaporate solvent. collect the product.