Осуществите превращения:С->CH4->CH3Br->CH2Br2->CHBr3-CBr4
1) C + 2H2 => CH4 2) CH4 + Br2 => CH3Br + HBr 3) CH3Br + Br2 => CH2Br2 + HBr 4) CH2Br2 + Br2 => CHBr3 + HBr 5) CHBr3 + Br2 => CBr4 + HBr