Осуществить схему превращения: C4H8 -> C4H10 -> C4H9Br -> C4H8Br2 -> C4H7Br3 -> C4H6Br4
C4H8+H2=C4H10 C4H10+Br2=C4H9Br+HBr C4H9Br+Br2=C4H8Br2+HBr C4H8Br2+Br2=C4H7Br3+HBr C4H7Br3+Br2=C4H6Br4+HBr