

1/n-butyl bromua --(KOH/ancol)-->A--(HBr)-->B---(Na/ete)-->C
2/3-iot-2-metylbutan --(KOH/ancol)->--(Br2)-->B
3/buten-1--(H2SO4)--->A---(H2O)--->B---(Al2O3)---->C
2/3-iot-2-metylbutan --(KOH/ancol)->--(Br2)-->B
3/buten-1--(H2SO4)--->A---(H2O)--->B---(Al2O3)---->C