Textbook Problem

. Indicate the missing molecule in each of the following reactions of alkenes.

a. ${\text{CH}}_2=\text{CH}—{\text{CH}}_3+{\text{H}}_2\stackrel{Pt}{\to }?$b. $?+{\text{Br}}_{\text{2}}\to .{\text{CH}}_{\text{2}}\text{Br}—\text{CHBr}—{\text{CH}}_3$   c. ${\text{2CH}}_{\text{2}}=\text{CH}—{\text{CH}}_3\text{+9}?\to {\text{6CO}}_{\text{2}}+{\text{6H}}_{\text{2}}\text{O}$