СH3 - С(Cl)(Cl) - СH2 - С(Cl)(Cl) - СH2 - СH3
CH2 = C(Cl) - CH(CH3) - C H2- CH3
CH(Br)= CH - C(CH3) = C(Br) - CH2 - CH3
СH3 - С(Cl)(Cl) - СH2 - С(Cl)(Cl) - СH2 - СH3
CH2 = C(Cl) - CH(CH3) - C H2- CH3
CH(Br)= CH - C(CH3) = C(Br) - CH2 - CH3