The correct order of the reactions starting from CaC2 is:

CaC2 $Calciumcarbide$ reacts with water to form Ca$OH$2 $Calciumhydroxide$Ca$OH$2 reacts with HCl $Hydrochloricacid$ to form CaCl2 $Calciumchloride$CaCl2 decomposes to form Ca $Calcium$Calcium reacts with phosphorus to form Ca3P2 $Calciumphosphide$