CaC2→C2H2→C2H4→C2H4Cl2

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The chemical formula given in the question involves the sequential conversion of calcium carbide (CaC2) into acetylene (C2H2), then into ethylene (C2H4), and finally into 1,2-dichloroethylene (C2H4Cl2).

The overall chemical equation representing this process would be:

CaC2 + 2 H2O → C2H2 + Ca(OH)2
C2H2 + H2 → C2H4
C2H4 + Cl2 → C2H4Cl2

Therefore, in the reaction pathway the formation of 1,2-dichloroethylene (C2H4Cl2) involves the conversion of calcium carbide to acetylene, then acetylene to ethylene, and finally ethylene to 1,2-dichloroethylene.