CH3-CH-CH3+Br2-X1+KOH(cп.р)-X2+HBr-X3
CH3
1. C4H10+Br2 = C4H9Br+HBr
2. C4H9Br+KOH = C4H9OH+KBr
3. C4H9OH+HBr = C4H9Br+H2O
X1 = X3 = C4H9Br X2 = C4H9OH