Give reason-1)acidity of oxo acid of chlorine is Hocl<Hoclo<HOCl2. 2)?

an organic compound having molecular formula C9H10O forms a orange red ppt B with 2,4 -DNP reagent.compound A gives yellow ppt C when heated with iodine& NaOH along with a colourless compound D. A does not reduce tollens& fehlings reagent nor decolourise Br water. on drastic oxidation of A with chromic acid a carboxlic acid E C7H6O7 is formed . deduce A&E