a. CH2=CH-CH3+Br2(t)---> CH2=CH-CH2Br+HBr
CH2=CH-CH2Br+Br2---> CH2=CH-CHBr2+HBr
CH2=CH-CHBr2+ H2---> CH3-CH2-CHBr2
b. CH2=CH-CH3 +Br2----> CH2Br -CHBr-Ch3
c. CH≡C-CH3 +HBr---> CH2=CBr-CH3
CH2=CBr-CH3+HBr---> CH3-CBr2-CH3
d. CH2=CH-CH3 +Br2---->CH2=CH-CH2Br
CH2=CH-CH2Br+HBr---> CH2Br-CH2-CH2Br