Question

C2H5OH->C2H4->C2H4Cl2->C2H2->CO2

Answer 1

С2H5OH => C2H4 + H2O
C2H4 + Cl2 => C2H4Cl2
C2H4Cl2 + 2KOH => C2H2 + 2KCl + 2H2O
2C2H2 +5O2 => 4CO2 + 2H2O

Answer 2

СH3-CH2-OH = CH2=CH2 + H2O
CH2=CH2 + Cl2 = CH2(Cl)-CH2(Cl)
CH2(Cl)-CH2(Cl) + 2KOH =(t,спирт.)= CH≡CH + 2KCl + 2H2O
2C2H2 +5O2 = 4CO2 + 2H2O