CaC03-->CaO-->CaC2-->C2H2-->C6H6-->C6H5NO2-->C6H5NH2-->C6H5NH2*HCl.

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The reaction pathway involves several steps:

CaCO3 (calcium carbonate) undergoes thermal decomposition to form CaO (calcium oxide) and CO2 (carbon dioxide).CaO then reacts with carbon to form CaC2 (calcium carbide) in an electric arc furnace.CaC2 undergoes hydrolysis with water to form acetylene (C2H2).Acetylene is then polymerized to form benzene (C6H6).Benzene is nitration with HNO3 to form nitrobenzene (C6H5NO2).Nitrobenzene is reduced with iron and hydrochloric acid to form aniline (C6H5NH2).Finally, aniline reacts with hydrochloric acid (HCl) to form aniline hydrochloride (C6H5NH2*HCl).

This entire process involves several chemical reactions and transformations to convert calcium carbonate into an organic compound, C6H5NH2*HCl.