Aldehydes, Ketones and Carboxylic Acids Part 2

Number of isomeric compounds with molecular formula C9H10O which
(i) do not dissolve in NaOH
(ii) do not dissolve in HCl.
(iii) do not give orange precipitate with 2, 4 - DNP
(iv) on hydrogenation give identical compound with molecular formula C9H12O is ________.