The reaction pathway you have stated involves several steps of chemical reactions.

CaC2 reacts with water to form C2H2 (acetylene gas).C2H2 undergoes a series of reactions to form C6H6 (benzene).Benzene then reacts with hydrogen to form C6H12 (cyclohexane).Cyclohexane can be further dehydrogenated to form benzene again.Finally, benzene can be reacted with nitric acid to form C6H5NO2 (nitrobenzene).

Overall, the transformation of CaC2 into C6H5NO2 involves a series of reactions involving different intermediates and products.