Total sum of oxygen atoms in Product A and Product B are ____
Answer: 14
Solution
Phenol treated first with conc. H2SO4 gives phenol-2,4-disulphonic acid (Product A), and subsequent treatment with conc. HNO3 gives picric acid, 2,4,6-trinitrophenol (Product B). Oxygen atoms: Product A, C6H3(OH)(SO3H)2, has 1+2×3=7 oxygens; Product B, C6H2(OH)(NO2)3, has 1+3×2=7 oxygens. Total =7+7=14.