4)CH3-CH2-CH3+Br2(t) =CH3-CHBr-CH3+HBr
CH3-CHBr-CH3+Br2(t) =CH3-CBr2-CH3+HBr
CH3-CBr2-CH3+2KOH=CH2=C=CH2+2KBr+2H2O
CH2=C=CH2+HCl=CH2=CCl-CH3
CH2=CCl-CH3+H2=CH3-CHCl-CH3.
7)C6H6+C2H5Cl(AlCl3)=C6H5-C2H5+HCl
C6H5-C2H5+Br2(t)= C6H5-CHBr-CH3+HBr
C6H5-CHBr-CH3+KOH=C6H5-CHOH-CH3+KBr
C6H5-CHOH-CH3(H2SO4,t)=C6H5-CH=CH2+H2O
C6H5-CH=CH2+2KMnO4+3H2SO4=C6H5-COOH+CO2+K2SO4+2MnSO4+4H2O