Benzoic acid and carbolic acid can be distiguished by:A. a.Aqueous `Na – InterviewSolution

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1.	Benzoic acid and carbolic acid can be distiguished by:A. a.Aqueous `NaHCO_(3)`B. b.Netural `FeCl_(3)`C. c.Aqueous `NaOH`D. d.Aqueous `NH_(3)`
Answer» Correct Answer - A::B a. Phenol is also called carbolic acid. Benzoic acid is more acidic than phenol. So the acid reacts with `NaHCO_(3)` to give `CO_(2)(g)`, while phenol does not react. b. Acids give buff-coloured precipitate with netural `FeCl_(3)` solution, e.g., `3PhCOOH+FeCl_(3) rarr underset("(But coloured ppt.)")underset("(Ferric benzoate)")((PhCOO)_(3)Fe)+3HCl` `3PhOH+FeCl_(3) rarr underset("(Violet colouration)")underset("(Ferric phenoxide)")((PhO)_(3)Fe+3HCl)` c. Both acid and phenol react with aqueous `NaOH` to give their corresponding salts. `PhCOOH+NaOH rarr PhCOONa` `PhOH+NaOH rarr PhONa` Both acid and phenol react with `NH_(3)`. `PhCOOH+NH_(3) rarr PhCONH_(2) "Benzamide") +H_(2)O` `PhOH+NH_(30 rarr PhNH_(2) ("Aniline")+H_(2)O` So the answers are `(a)` and `(b)`.

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