а. СН4+Br2 = CH3Br + HBr CH3Br + Br2 = CH2Br2+HBr CH2Br2+Br2=CHBr3+HBr CHBr3 + Br2 = CBr4 + HBr
б. С2Н6 = С2Н4 + Н2
а. СН4+Br2 = CH3Br + HBr
CH3Br + Br2 = CH2Br2+HBr
CH2Br2+Br2=CHBr3+HBr
CHBr3 + Br2 = CBr4 + HBr
б. С2Н6 = С2Н4 + Н2
б. С2Н6 = С2Н4 + Н2
Дальше тоже тебе написать?