CaCO3 -> CO2 -> CO -> C -> CH4 -> CH3Br -> CH2Br2

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This series of reactions shows the breakdown of calcium carbonate (CaCO3) into methane dibromide (CH2Br2) through a series of intermediate steps. Here is how the reactions proceed:

CaCO3 (calcium carbonate) breaks down into CO2 (carbon dioxide).CO2 is reduced to CO (carbon monoxide).CO undergoes further reduction to form C (carbon).C reacts with hydrogen (H2) to form CH4 (methane).Methane is halogenated to form CH3Br (methyl bromide).CH3Br is further halogenated to form CH2Br2 (methyl dibromide).

This series of reactions shows the transformation of a mineral compound like calcium carbonate into a halogenated organic compound like methyl dibromide through various chemical reactions.