CaCO3= CaO+CO2CaO+3C=CaC2+COCaC2+2H2O=C2H2+Ca(OH)23C2H2=C6H6C6H6+HONO2=C6H5NO2+H2OC6H5NO2+6H=C6H5NH2+2H2OC6H5NH2+3Br2=C6H2Br3NH2+3HBr
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CaCO3= CaO+CO2
CaO+3C=CaC2+CO
CaC2+2H2O=C2H2+Ca(OH)2
3C2H2=C6H6
C6H6+HONO2=C6H5NO2+H2O
C6H5NO2+6H=C6H5NH2+2H2O
C6H5NH2+3Br2=C6H2Br3NH2+3HBr