An aromatic compound $‘\mathrm{A}’$ (Molecular formula ${\mathrm{C}}_8{\mathrm{H}}_8\mathrm{O}$) gives positive $2, 4-\mathrm{DNP}$ test. It gives a yellow precipitate of compound $‘\mathrm{B}’$ on treatment with iodine and sodium hydroxide solution. Compound $‘\mathrm{A}’$ does not give Tollen’s or Fehling’s test. On drastic oxidation with potassium permanganate it forms a carboxylic acid $‘\mathrm{C}’$ (Molecular formula ${\mathrm{C}}_7{\mathrm{H}}_6{\mathrm{O}}_2$), which is also formed along with the yellow compound in the above reaction. Identify $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ and write all the reactions involved.