An organic compound (A) of molecular formula C2H4O reduces tollen’s reagent to silver mirror. (A) on treatment with C2H5MgBr followed by acid hydrolysis gives (B) of formula C4H10O. (B) on reaction with Cu at 573 K gives (C) of formula C4H8O which does not reduce tollen’s reagent but answers iodoform test. Identify A,B,C,D and explain the reaction involved.
