a) C4H8+HCl--->C4H9Cl chlorobutan
CH2=CH-CH2-CH3+HCl--->CH3-CH2Cl-CH2-CH3
b) C3H6+I2--->C3H6I2 dijodopropan
CH2=CH-CH3+I2--->CH2I-CHI-CH3
c) C4H8+H2--->C4H10 butan
CH2=CH-CH2-CH3+H2--->CH3-CH2-CH2-CH3
d) C5H10+HBr--->C5H11Br bromopentan
CH2=CH-CH2-CH2-CH3+HBr--->CH3-CHBr-CH2-CH2-CH3