An organic compound A of molecular formula C_(6)H_(6)O gives violet colouration with neutral FeCl_(3). Compound A on treatment with metallic Na gives compound B. Compound B on treatment with CO_(2) at 400 K under pressure gives C. This product on acidification gives compound D (C_(7)H_(6)O_(3)) which is used in medicine. Identify A,B, C and D and explain the reaction.

An organic compound A of molecular formula C_(6)H_(6)O gives violet co

1.	An organic compound A of molecular formula C_(6)H_(6)O gives violet colouration with neutral FeCl_(3). Compound A on treatment with metallic Na gives compound B. Compound B on treatment with CO_(2) at 400 K under pressure gives C. This product on acidification gives compound D (C_(7)H_(6)O_(3)) which is used in medicine. Identify A,B, C and D and explain the reaction.
Answer» Solution :(i) Compound A is phenol `(C_(6)H_(5)OH)` Phenols on reaction with metallic Na gives compound (B) i.e., Sodium Phenoxide. `3C_(6)H_(5)OH + 2Na to 2C_(6)H_(5) O"Na" + H_(2)` (II) (B) is heated with `CO_(2)` at 400 K under pressure, to give (C ). This is decomposed by dil. HCl, and (D) is formed.