A compound H3BO3 is heated with C2H5OH and H2SO4, the fumes produced burn with green flame.The green flame is due to the formation of

When ortho boric acid is burnt with ethyl alcohol in presence of Conc H2SO4 gives triethyl ortho borate.When the vapours of triethyl borate ignited burn with a green edged flame.The green edged flame is due to the combustion of ethyl borate.This test is used to detect the borates and boric acid in qualitative analysis.