Question

C2H5OH -(t,H2SO4(конц.))->
2C2H5OH-(t,H2SO4(конц.))->
2CH3OH(t,H2SO4(конц.))->
CH3-CH2Cl+KOH-(t)->

Answer 1

C2H5OH-->C2H4+H2O (кат. H2SO4, t>170°C)
2C2H5OH-->C2H5-O-C2H5+H2O (кат. H2SO4, t<140°C)
2CH3OH-->CH3-O-CH3+H2O (кат. H2SO4, t<140°C)
CH3-CH2Cl+KOH(сп.)-->CH2=CH2+KCl+H2O