An organic compound [X] (Molecular formula \( C_6H_{12}O_2 \)) reacts with dil. \( H_2SO_4 \) to form an alcohol [B] and a carboxylic acid [C]. Reaction of compound [B] with Jones reagent yielded compound [C]. When compound [C] was heated with \( P_2O_5 \) an Anhydride was formed. Compound [X] is --------