2CH4=C2H2+3H2
3C2H2=(C)=C6H6
C6H6+CH3Cl==(AlCl3)==C6H5CH3+HCL
5C6H5CH3+6KMnO4+9H2SO4=5C6H5COOH+3K2SO4+6MnSO4+14H2O
A - бензойная кислота