CaC2->C2H2->C2H4->C2H5OH-> C2H4->CO2

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The chemical equation you've provided shows the progression from calcium carbide (CaC2) to carbon dioxide (CO2) through various chemical reactions:

CaC2 is reacted with water to produce acetylene (C2H2).Acetylene (C2H2) is further reacted to produce ethylene (C2H4).Ethylene (C2H4) can be converted to ethanol (C2H5OH) through a hydration reaction.The ethanol (C2H5OH) can be further reacted to produce ethylene (C2H4) again.Finally, ethylene (C2H4) can be oxidized to form carbon dioxide (CO2).

Each step in this series of reactions involves different chemical processes and transformations of the starting material, showing the versatility and reactivity of the compounds involved.