Объяснение:
CH3-CH3 + Cl2 -> CH3-CH2-Cl + HCl (hy)
CH3-CH2-Cl + KOH(спирт) -> CH2=CH2 + KCl + H2O
CH2=CH2 + Br2 -> CH2(Br)-CH2(Br)
CH2(Br)-CH2(Br) +2KOH -> CH=-CH + 2KBr + 2H2O
3CH=-CH -> C6H6
