Ответ:

CaC2+2HOH=Ca(OH)2+C2H2

3C2H2=C6H6

C6H6+CH3-CH-CH3 = C6H5-CH-CH3  +HCl -р-ция Фриделя-Крафтса

                         |                               |

                         Cl                           CH3

C6H5-CH(CH3)-CH3 +KMnO4+H2SO4=C6H5-COOH +MnSO4+K2SO4+H2O+2CO2

C6H5-COOH+ HO-NO2(H2SO4) =C6H4NO2-COOH+H2O

                                                          3-нитробензойная к-та