A carbonyl compound of formula ${\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}\mathrm{}\left(\mathrm{A}\right)$ , which is a benzene derivative gives orange precipitate with 2,4 ‐D.N.P. and also gives yellow precipitate with ${\mathrm{I}}_2$ in presence of aqueous $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}.$ The total no. of isomers possible for ‘A’ are_____