Question

С2н5он-с2н4-с2н6-с2н5Clс2н4-с2н4Вr2

Answer 1

C2H5OH (t,h2so4)= C2H4 + H2O

C2H4 + H2 (t,Ni)= C2H6

C2H6 + Cl2 (hv)= C2H5Cl + HCl

C2H5Cl = C2H4 + HCl

C2H4 + Br2 = C2H4Br2