общая формула алкенов СnH2n
CnH2n + H2 = CnH2n+2
n(H2) = V/Vm = 0,448/22,4 = 0,02 моль
n(cnH2n) = 0,02 моль
CnH2n + Br2 = CnH2nBr2
n(CnH2n) = n(CnH2nBr2) = 0,02 молл
M(CnH2nBr2) = m/n = 4,32/0,02 = 216 г/моль
12n + 2n + 160 = 216
14n = 56
n = 4 => C4H8
CH2=C(CH3)-CH3 + Br2 = CH2(Br)-C(Br)(CH3)-CH3
Rb ----- Rb₂O --- RbOH ----- RbCl
Br₂ --- HBr ---- KBr
1)5C6H5-CH3+6KMnO4+9H2SO4=5C6H5-COOH +3K2SO4+6MnSO4+14H2O
C(-3) -6e =C(+3) -5
Mn(+7) +5e =Mn(+2) -6
5C(-3) +6Mn(+7) = 5C(+3) + 6Mn(+2)
2)C3H6+2KMnO4+2KOH=CH3-CH(OH)-CH2(OH) +2K2MnO4
C(-2) -1e=C(-1) -2
Mn(+7) +1e =Mn(+6) -1
C +1e= C(-1)
2C(-2) +Mn(+7) +C=2C(-1) +Mn(+6) +C(-1)
3)CH3-CH2-COH +2Cu(OH)2= CH3-CH2-COOH +Cu2O+2H2O
C(+1) -2e=C(+3) -1
2Cu(+2) +2e= 2Cu(+1) -1
C(+1) +2CU(+2) =C(+3) +2Cu(+1)
CH2 = C(C2-CH3) - C(CH3) = CH - CH2 - CH3