CH3-CH=CH2+Br2=[500°C]=CH2Br-CH=CH2+HBr
CH2Br-CH=CH2+Mg= CH2=CH-CH2-MgBr
CH2=CH-CH2-MgBr+HCHO+HCl= CH2=CH-CH2-CH2-OH+MgBrCl
CH2=CH-CH2-CH2-OH +2HBr=CH3-CH(Br)-CH2-CH2(Br)+H2O
CH3-CH(Br)-CH2-CH2(Br)+KOH=2KBr+2H2O+CH3-C≡C-CH3 (точно не уверена на счет последней реакции)