CaCO3--->CAO--->CaC2--->C2H2--->CH2=CHCl---->(-CH2-CH-)n | CL

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The reaction you've described involves several steps of chemical transformation. Here is a summary of the reactions involved:

Calcium carbonate (CaCO3) is decomposed to form calcium oxide (CaO).Calcium oxide (CaO) reacts with carbon to form calcium carbide (CaC2).Calcium carbide (CaC2) reacts with water to produce acetylene gas (C2H2).Acetylene gas (C2H2) undergoes a series of reactions to form vinyl chloride (CH2=CHCl).Vinyl chloride (CH2=CHCl) polymerizes to form polyvinyl chloride (-CH2-CH-)n.Chlorine gas (Cl2) is then used as a reactant in the polymerization process.

Overall, this reaction sequence involves the conversion of calcium carbonate to polyvinyl chloride through a series of chemical reactions.