The correct order of the reactions starting from CaC2 is:

CaC2 (Calcium carbide) reacts with water to form Ca(OH)2 (Calcium hydroxide)Ca(OH)2 reacts with HCl (Hydrochloric acid) to form CaCl2 (Calcium chloride)CaCl2 decomposes to form Ca (Calcium)Calcium reacts with phosphorus to form Ca3P2 (Calcium phosphide)