An organic compound A (C2H6O) reacts with sodium to form a compound 'B' wih evolution of H2 gas and gives a yellow ppt. 'C' when treated with I2 and NaOH. When heated with conc. H2SO4 at 413k. "A" gives a compound D(C4H10O) which on reaction with conc. HI at 373H gives E. D is also obtained when B is heaed with E. Identify A to E.