Alkyl halides such as Chlorofluorocarbons have also been widely used as refrigerants, propellants and solvents due to their low toxicity and high heat capacity.
Use sodium amide to deprotonate acetylene and react it with iodoethane (or equivilent) two times to form 3-hexyne. Use sodium amide again to "move" the triple bond to a terminal position (to make...