Ethanol is converted into ethoxy ethane,
(1) by heating Ethanol with excess of conc. H2SO4 at 443 K.
(2) by treating with conc. H2SO4 at 273 K.
(3) by heating excess of ethanol with conc. H2SO4 at 140°C.
(4) by treating with conc. H2SO4 at room temperature.