An aromatic hydrocarbon [ A ] ( Molecular . formula . C ₉ H ₁₂ ) , undergoes air oxidation followed by reaction with dil. HCl to give [B] as one of the products Compound [B] forms a white precipitate on treatment with Br ₂( aq ) Sodium salt of [B] reacts with CO ₂ at 400 ~K under high pressure followed by acid hydrolysis to give [C] Compound [C] reacts with acetic anhydride / conc. H ₂ SO ₄ to form [D] Identify compo

Step-by-step solution

The aromatic hydrocarbon [A] with molecular formula C₉H₁₂ that undergoes air oxidation (cumene process) is isopropylbenzene (cumene). Air oxidation of cumene followed by treatment with dilute HCl yields phenol and acetone as products. Compound [B] is phenol ( C₆H₅OH ), which forms a white precipitate of 2,4,6-tribromophenol on treatment with Br₂(aq) . The sodium salt of phenol (sodium phenoxide) reacts with CO₂ at 400 K under high pressure followed by acid hydrolysis (Kolbe-Schmitt reaction) to give salicylic acid