When ethyl alcohol is heated with conc H2SO4 at 160∘−170∘C the product obtained is ethylene (C2H4) CH3−CH2OH+H2SO4→ethyl hydrogen sulphateCH3CH2HSO4+H2O CH3−CH2HSO4160-170∘CΔethyleneCH2=CH2+H2SO4
but at lower temperature ether is formed